Saqib Ullah

how to assign value. you have poseted wrong info.
pword = "admin"; never works.

You can assign a value to a SecureString as follows:

SecureString secureString = new secureString();
string myPassword = "secret";

foreach (char c in myPassword)
secureString.AppendChar(c);

secureString.MakeReadOnly();

I hope no one ever assigns a value like Cassidy shows. That method still generates a clear text string on the heap and can still be extracted. You have to move away from thinking of whole strings and start thinking about character by character operations here. You assign the value of a SecurityString by using the class's AppendChar(char) method and you call this on each keypress. That event handler should look like this:

System.Security.SecureString ss = new System.Security.SecureString();

public Form1()
{
InitializeComponent();
}

void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
try
{
switch (e.KeyChar)
{
case (char)Keys.Enter:
ss.MakeReadOnly();
HandleSecurePassword(ss);
break;
case (char)Keys.Back:
ss.RemoveAt(ss.Length - 1);
break;
default:
if (!ss.IsReadOnly())
{
ss.AppendChar(e.KeyChar);
}
break;
}
}
catch (ObjectDisposedException)
{
ss = new System.Security.SecureString();
MessageBox.Show("your string was disposed at some point. you should be able to try again");
}
catch (ArgumentOutOfRangeException)
{ } //do nothing. at best you're trying to press backspace on an empty string. this isn't special enough to warrant a modal dialog. maybe after 1000 tries you might want to pop up and tell the user they're doing something stupid. ;)
}

private void HandleSecurePassword(System.Security.SecureString ss)
{
//logic goes here
}

Another comment. After you press enter and HandleSecurityPassword executes you should be able to just new another SecurityString object to ss if that would make sense in what you're trying to do. Otherwise, according to this code, ss's value will never change after you press enter.

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