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Vinz' Blog (ProudMonkey) "Code, Beer and Music ~ my way of being a programmer"

This example is a continuation of my previous post about “Adding Rows in GridView”. In this example I will going to demonstrate on how we are going to do Edit, Update and Delete operations in GridView using TemplateField Columns. If you wan’t to implement those operations using BoundField Columns then you can refer to my previous example about “GridView: Insert, Edit, Update and Delete – the ADO.NET way”.

Since this example is a continuation, then I would recommend you to start reading this example first before you proceed.

To get started, let’s set up our GridView to allow editing of Rows. Since we are not using BoundFields in this example then we need to set up our own Edit fields using EditItemTemplate. See the mark up below:

<asp:GridView ID="GridViewEmployee" runat="server" AutoGenerateColumns="False"

        ShowFooter="True" onrowcancelingedit="GridViewEmployee_RowCancelingEdit"

        onrowediting="GridViewEmployee_RowEditing"

        onrowupdating="GridViewEmployee_RowUpdating"

        onrowdeleting="GridViewEmployee_RowDeleting">

    <Columns>

        <asp:TemplateField HeaderText="Employee Name">

            <EditItemTemplate>

                <asp:TextBox ID="TextBoxEditEmployee" runat="server" Text='<%# Bind("Employees") %>'/>

            </EditItemTemplate>

            <ItemTemplate>

                <asp:Label ID="LabelEmployee" runat="server" Text='<%# Bind("Employees") %>'/>

            </ItemTemplate>

            <FooterTemplate>

                <asp:TextBox ID="TextBoxEmployee" runat="server"/>

            </FooterTemplate>

        </asp:TemplateField >

        <asp:TemplateField HeaderText="Position">

            <EditItemTemplate>

                <asp:TextBox ID="TextBoxEditPosition" runat="server" Text='<%# Bind("Position") %>'/>

            </EditItemTemplate>

            <ItemTemplate>

                <asp:Label ID="LabelPosition" runat="server" Text='<%# Bind("Position") %>'/>

            </ItemTemplate>

            <FooterTemplate>

                    <asp:TextBox ID="TextBoxPosition" runat="server"/>

            </FooterTemplate>

        </asp:TemplateField>

        <asp:TemplateField HeaderText="Team Name">

            <EditItemTemplate>

                <asp:TextBox ID="TextBoxEditTeam" runat="server" Text='<%# Bind("Team") %>'/>

            </EditItemTemplate>

            <ItemTemplate>

                <asp:Label ID="LabelTeam" runat="server" Text='<%# Bind("Team") %>'/>

            </ItemTemplate>

            <FooterTemplate>

                    <asp:TextBox ID="TextBoxTeam" runat="server"/>

            </FooterTemplate>

        </asp:TemplateField>

        <asp:TemplateField HeaderText="Employee ID">

            <ItemTemplate>

                <asp:Label ID="LabelID" runat="server" Text='<%# Bind("Id") %>'/>

            </ItemTemplate>

            <FooterTemplate>

                <asp:Button ID="Button1" runat="server" Text="Add New" OnClick="Button1_Click" />

            </FooterTemplate>

        </asp:TemplateField>

        <asp:CommandField ShowEditButton="True" ShowDeleteButton />

    </Columns>

    </asp:GridView>

 

Notice that under EditItemTemplate, we added a TextBox control for each column. These columns will be shown once we set the GridView to edit mode. Now let’s create the methods first for updating the GridView data.

Here’s the code block below:

private void UpdateRecord(string id,string employee, string position, string team)

    {

        SqlConnection connection = new SqlConnection(GetConnectionString());

        string sqlStatement = "UPDATE Table1 " +

                              "SET Employees = @Employees, Position = @Position, Team = @Team " +

                              "WHERE Id = @Id";

        try

        {

            connection.Open();

            SqlCommand cmd = new SqlCommand(sqlStatement, connection);

            cmd.Parameters.AddWithValue("@Employees", employee);

            cmd.Parameters.AddWithValue("@Position", position);

            cmd.Parameters.AddWithValue("@Team", team);

            cmd.Parameters.AddWithValue("@Id", id);

            cmd.CommandType = CommandType.Text;

            cmd.ExecuteNonQuery();

        }

        catch (System.Data.SqlClient.SqlException ex)

        {

            string msg = "Insert/Update Error:";

            msg += ex.Message;

            throw new Exception(msg);

        }

        finally

        {

            connection.Close();

        }

    }

 

As you can see, the code above was pretty self explanatory and very straight forward. Now let’s set up the events for handling the Edit and Update exections.

Editing, Cancelling and Updating the Data in GridView

One of the good things about GridView is that it provides a built-in CommandField Buttons which allows us to perform certain actions like editing, updating,deleting and selecting of GridView data.

To add those command fields mentioned in the GridView you can follow these few steps below:

1.       Switch to Design View

2.       Right Click on the GridView and Select  --> Show Smart Tag --> Add New Columns

3.       On the List Select CommandField

4.       Check Delete and Edit/Update options then OK

 

As you can see the Edit and Delete CommandField are automatically added in the last column of GridView.  Now we can start to write our codes for editing and updating the information in the GridView.

In-order to perform Edit and Update in GridView we need to use three events ( GridView_RowEditing, GridView_RowCancelingEdit , GridView_RowUpdating). For those who do not know on how to generate Events in GridView you can follow these steps below:

1.       Switch to Design View in Visual Studio Designer

2.       Click on the GridView

3.       Navigate to the GridView Property Pane and then SWITCH to Event Properties

4.       From there you would be able to find the list of events including those three  events mentioned above

5.       Double Click on that to generate the Event handler for you

6.       Then write the codes there

 

Here are the codes for each event:

    protected void GridViewEmployee_RowEditing(object sender, GridViewEditEventArgs e)

    {

        GridViewEmployee.EditIndex = e.NewEditIndex; // turn to edit mode

        BindGridView(); // Rebind GridView to show the data in edit mode

    }

 

    protected void GridViewEmployee_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

    {

        GridViewEmployee.EditIndex = -1; //swicth back to default mode

        BindGridView(); // Rebind GridView to show the data in default mode

    }

 

    protected void GridViewEmployee_RowUpdating(object sender, GridViewUpdateEventArgs e)

    {

       //Accessing Edited values from the GridView

        string id = ((Label)GridViewEmployee.Rows[e.RowIndex].Cells[3].FindControl("LabelID")).Text; //ID

        string employee = ((TextBox)GridViewEmployee.Rows[e.RowIndex].Cells[0].FindControl("TextBoxEditEmployee")).Text; //Employee

        string position = ((TextBox)GridViewEmployee.Rows[e.RowIndex].Cells[1].FindControl("TextBoxEditPosition")).Text; //Position

        string team = ((TextBox)GridViewEmployee.Rows[e.RowIndex].Cells[2].FindControl("TextBoxEditTeam")).Text; //Team

 

        UpdateRecord(id, employee, position, team); // call update method

 

        GridViewEmployee.EditIndex = -1; //Turn the Grid to read only mode

 

        BindGridView(); // Rebind GridView to reflect changes made

 

        Response.Write("Update Seccessful!");

    }

 

When you run the page, the output would look similar to this:

GridView in Read-Only Mode

 

GridView in Edit Mode

 

GridView after Edit Mode


Since, we already know how to edit the data in the GridView, then let’s go ahead and implement the Deletion.

Performing Delete in GridView

Here’s the method for the Deletion

 

    private void DeleteRecord(string ID)

    {

        SqlConnection connection = new SqlConnection(GetConnectionString());

        string sqlStatement = "DELETE FROM Table1 WHERE Id = @Id";

 

        try

        {

            connection.Open();

            SqlCommand cmd = new SqlCommand(sqlStatement, connection);

            cmd.Parameters.AddWithValue("@Id", ID);

            cmd.CommandType = CommandType.Text;

            cmd.ExecuteNonQuery();

        }

        catch (System.Data.SqlClient.SqlException ex)

        {

            string msg = "Deletion Error:";

            msg += ex.Message;

            throw new Exception(msg);

        }

        finally

        {

            connection.Close();

        }

    }

 

 

Since we are using the Built-in Delete CommandField Button in GridView, then we can use the GridView_RowDeleting event to delete specific row in GridView.

Here’s the code block below:

    protected void GridViewEmployee_RowDeleting(object sender, GridViewDeleteEventArgs e)

    {

        //get the ID of the selected row

        string id = ((Label)GridViewEmployee.Rows[e.RowIndex].Cells[3].FindControl("LabelID")).Text;

        DeleteRecord(id); //call the method for delete

 

        BindGridView(); // Rebind GridView to reflect changes made

    }

 

That’s it! Hope you will find this example useful!

Technorati Tags: ,,,
Posted on Wednesday, June 10, 2009 2:28 AM ADO.NET , ASP.NET , C# , GridView | Back to top


Comments on this post: Adding Rows in GridView with Edit, Update and Delete Functionality

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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This is an excellant artical to have add, edit and delete functions in a grid view. It worked for me and helped saving lot of time.

Thanks dude!!!
Left by Srini on Jun 19, 2009 10:50 AM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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wrong it is not updatiing any value..
Its caputuring old values
Left by vikas on Jun 22, 2009 8:18 AM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Thanks. Its working fine for me. Thank u again

Regards
Anowar
Left by Anowar on Jun 23, 2009 9:33 AM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Very Thanks... Have a nice day~~~
Left by devker on Jul 28, 2009 1:43 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Hi,
This is really good artical.It help a lot to understand basics of GridView.

Thanks
Akshay Kr Saxena
Left by Akshay on Jul 29, 2009 7:06 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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THANK YOU!! I couldn't find any good help working with GridViews until I came across your site. You are AWESOME! Thank you. =)
Left by Charity on Aug 12, 2009 5:17 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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This is one of the better example on-line for the Edit/update problems people seem to have with gridview
Left by Very Good on Aug 25, 2009 2:38 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Can you show me what you coded in your Page Load ?

I am having problem with the Page Load and if I don't have Postback, I am not able to update the database using the new values I entered.

Thanks.
Left by Dave on Oct 05, 2009 10:10 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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not sure if you experience this scenario ...

when i click update, the newly updated value not being captured.

let's say, my original value is : 1
when i click update, the field will be 1,,
then i click edit and update again, it will be, 1,,1,,

it seems the old value being concat again.
Left by Dave on Oct 06, 2009 7:05 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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It can't get into database at all because, it is numeric field and 1,, is string.

I don't think anything wrong with my code, it is pretty standard like what you use here. I just don't understand even if I put empty value and click update, I will get ,, as the value.
---------------

protected void gvList_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txtOverrideMin = (TextBox)gvList.Rows[e.RowIndex].FindControl("txtOverrideMin");
TextBox txtOverrideMax = (TextBox)gvList.Rows[e.RowIndex].FindControl("txtOverrideMax");
TextBox txtComments = (TextBox)gvList.Rows[e.RowIndex].FindControl("txtComments");

Int32.TryParse(txtOverride.Text, out Qty_override);
Int32.TryParse(txtOverrideMin.Text, out Qty_override_min);
Int32.TryParse(txtOverrideMax.Text, out Qty_override_max);

comments = txtComments.Text;

Left by Dave on Oct 06, 2009 9:09 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Hay this is good article . I have one more qry . in the grid if i have a dropdown how should i edit the value of that ?
Left by Manjunath on Oct 29, 2009 5:32 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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hi i am using the same code wat u r using but i am getting the error like this "Conversion failed when converting the nvarchar value '__Page' to data type int"
Left by msg4karthik on Dec 07, 2009 11:23 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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i am using nvarchar for a column called hours where its displays the hours like 01 or 12 like this.. for this how, i can pass the parameter values with this datatype if change that value to integer its displaying the same error.. i am using sql2005 "Conversion failed when converting the nvarchar value '__Page' to data type int"
Left by msg4karthik on Dec 09, 2009 5:32 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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YEAH I AM POSTED IN http://forums.asp.net/ ALSO... help me regarding this
Left by msg4karthik on Dec 09, 2009 9:51 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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string Title = ((TextBox)Grdvwentry.Rows[e.RowIndex].Cells[2].FindControl("TextBoxEditTitle")).Text; //Title


the details are:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Left by neeraj on Jan 29, 2010 12:48 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Remove link button functionality isnt working and is removing the values of previous row as well
Left by deepa on Feb 22, 2010 6:35 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Code is Good but i am unable to update record
Left by SIVA on Mar 09, 2010 7:29 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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SqlCommand com = new SqlCommand("UPDATE Employee" + "SET [ID]=@ID,[FirstName]=@FirstName,[LastName]=@LastName,[Salary]=@Salary,[City]=@City"+"Where [ID]=@ID", con);
string ID = ((TextBox)GridView1.Rows[e.RowIndex].Cells[0].Controls[0].FindControl("TextBox1")).Text.ToString();
Left by SIVA on Mar 10, 2010 7:35 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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SqlCommand com = new SqlCommand("UPDATE Employee" + "SET [ID]=@ID,[FirstName]=@FirstName,[LastName]=@LastName,[Salary]=@Salary,[City]=@City"+"Where [ID]=@ID", con);
string ID = ((TextBox)GridView1.Rows[e.RowIndex].Cells[0].Controls[0].FindControl("TextBox1")).Text.ToString();
I am geting Error near ID
Left by SIVA on Mar 10, 2010 7:48 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
Requesting Gravatar...
SqlCommand com = new SqlCommand("UPDATE Employee" + "SET [ID]=@ID,[FirstName]=@FirstName,[LastName]=@LastName,[Salary]=@Salary,[City]=@City"+"Where [ID]=@ID", con);
string ID = ((TextBox)GridView1.Rows[e.RowIndex].Cells[0].Controls[0].FindControl("TextBox1")).Text.ToString();
i am getting Error near ID,
Left by SIVA on Mar 10, 2010 7:58 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
Requesting Gravatar...
Object reference not set to an instance of an object.
i am getting error like this and please give one example for image delete button for users and also accordion Example .
Thanks for giving replay to me.
Left by SIVA on Mar 11, 2010 1:00 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Error occured when
string ID=((Label)GridView1.Rows[e.RowIndex].Cells.FindControl("Label1").Text;
I am Getting Error here
Left by SIVA on Mar 11, 2010 6:15 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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click below link for more help

http://programmingbook1.blogspot.com/
Left by vikas on Mar 16, 2010 2:42 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Very Good Example
Left by Reshma on Mar 25, 2010 8:35 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Hi,
I am using the same code given by you, but i want to use the grid view for data entry, i.e., there will be no data in the gridview at page_load.
In this case i am not able to see the gridview itself.

Regards,
Piyush
Left by Piyush Agrawal on Mar 30, 2010 4:35 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Vinz,

What i want is that i should be able to see the "Add New" row,i.e., option to enter new data even if my datasource is empty. I tried the link given by you. I put the textfields in the footer but still am not able to see the footer. Took your exact code.

Regards,
Piyush.
Left by Piyush Agrawal on Mar 30, 2010 5:14 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
Requesting Gravatar...
Vinz,

Included it now and its working. Thanks a lot Vinz.

Regards,
Piyush.
Left by Piyush Agrawal on Mar 30, 2010 5:31 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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no comments but its not enough to learn
Left by anand on Apr 21, 2010 6:00 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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awesome dude..
Left by Sandeep on Jun 08, 2010 7:42 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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i don't want to update to database directly, i just want to keep in data table first; and then i'll update later. can it be or not?
Left by gobbolino on Jun 16, 2010 11:05 AM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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you have given the code for update and delete what about for insert? If possible can you mention code for add new?
Left by jessicka on Jul 20, 2010 6:13 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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I am having the problem of getting old data when I try to update the rows. And I don't bind data on every post back.
Left by DeanC on Aug 05, 2010 5:45 AM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Hi, Its a nice article, I used the code and also added sorting and page indexing but seems it does not work properly, Can you please include sorting and page indexing feature of gridview and see it things work same. My code does not work properly after applying sorting, seems the rowupdating event forgets whom to edit.
Left by varun on Aug 31, 2010 1:27 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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How to edit,update and delete grid view i had understand...........
Left by thulasiram.s on Dec 13, 2010 5:54 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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it not working it always return old value of textbox .pls help me my code is

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string ref_no = ((HyperLink)GridView1.Rows[e.RowIndex].Cells[0].FindControl("hypref")).Text; //LabelREF_NO
string ref_mat_no = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].FindControl("TextBoxEditREF_MAT_NO")).Text;
string req_type = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].FindControl("TextBoxEditREQ_TYPE")).Text;
string item_type = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].FindControl("TextBoxEditITEM_TYPE")).Text;
string mill = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].FindControl("TextBoxEditMILL")).Text;
string draw_type = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].FindControl("TextBoxEditDRAW_TYPE")).Text;
string geometry = ((TextBox)GridView1.Rows[e.RowIndex].Cells[6].FindControl("TextBoxEditGEOMETRY")).Text;
string category = ((TextBox)GridView1.Rows[e.RowIndex].Cells[7].FindControl("TextBoxEditCATEGORY")).Text;
string spec = ((TextBox)GridView1.Rows[e.RowIndex].Cells[8].FindControl("TextBoxEditSPEC")).Text.ToString();
string grade = ((TextBox)GridView1.Rows[e.RowIndex].Cells[9].FindControl("TextBoxEditGRADE")).Text;
string sur_finish = ((TextBox)GridView1.Rows[e.RowIndex].Cells[10].FindControl("TextBoxEditSUR_FINISH")).Text;
string classs = ((TextBox)GridView1.Rows[e.RowIndex].Cells[11].FindControl("TextBoxEditCLASS")).Text;
string end_finish = ((TextBox)GridView1.Rows[e.RowIndex].Cells[12].FindControl("TextBoxEditEND_FINISH")).Text;
string ins_code = ((TextBox)GridView1.Rows[e.RowIndex].Cells[13].FindControl("TextBoxEditINS_CODE")).Text;
string out_dia = ((TextBox)GridView1.Rows[e.RowIndex].Cells[14].FindControl("TextBoxEditOUT_DIA")).Text;
string in_dia = ((TextBox)GridView1.Rows[e.RowIndex].Cells[15].FindControl("TextBoxEditIN_DIA")).Text;
string avl_part_no = ((TextBox)GridView1.Rows[e.RowIndex].Cells[16].FindControl("TextBoxEditAVL_PART_NO")).Text;
string thickness = ((TextBox)GridView1.Rows[e.RowIndex].Cells[17].FindControl("TextBoxEditTHICKNESS")).Text;
string length = ((TextBox)GridView1.Rows[e.RowIndex].Cells[18].FindControl("TextBoxEditLENGTH")).Text;
string len1 = ((TextBox)GridView1.Rows[e.RowIndex].Cells[19].FindControl("TextBoxEditLEN1")).Text;
string len2 = ((TextBox)GridView1.Rows[e.RowIndex].Cells[20].FindControl("TextBoxEditLEN2")).Text;
string divn = ((TextBox)GridView1.Rows[e.RowIndex].Cells[21].FindControl("TextBoxEditDIVN")).Text;
string plant = ((TextBox)GridView1.Rows[e.RowIndex].Cells[22].FindControl("TextBoxEditPLANT")).Text;

UpdateRecord(ref_no, ref_mat_no, req_type, item_type, mill, draw_type, geometry, category, spec, grade, sur_finish, classs, end_finish, ins_code, out_dia, in_dia, avl_part_no, thickness, length, len1, len2, divn, plant);

GridView1.EditIndex = -1;
BindGrid(Session["user"].ToString());

Response.Write("Update Success");


}
Left by awinash kumar on May 21, 2011 2:16 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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@awinash kumar,

If you are binding your GridView at Page_Load event then make sure that you put your codes for binding within Not IsPostback block.
Left by Vinz on May 25, 2011 4:46 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Excellent Sir>>>>>>>>>>>>

Nice code for learner
Thanks
Left by Raman on Jun 15, 2011 5:55 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Good learning procedure Sir
Thanks
Left by Samiullah on Sep 14, 2011 6:04 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Is it not possible to update the records if the GridView rows are in auto-generate mode? If yes, the how?
Left by Ajit Dubey on Sep 29, 2011 5:43 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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really excellent article
Left by asp.net1 on Nov 24, 2011 9:28 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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Thanks Dude! great article!
Left by tmt on Dec 15, 2011 5:39 PM

# re: Adding Rows in GridView with Edit, Update and Delete Functionality
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This is really a very nice and properly explained article.

Nice work :)
Left by @nkit on May 15, 2012 12:56 PM

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