Here’s an example on how to highlight GridView rows on mousover at RowCreated or RowDataBound event of GridView by simply adding an attributes to the row.

Here’s the code block:

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
        string onmouseoverStyle = "this.style.backgroundColor='blue'";
        string onmouseoutStyle = "this.style.backgroundColor='white'";
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes.Add("onmouseover", onmouseoverStyle);
            e.Row.Attributes.Add("onmouseout", onmouseoutStyle);
        } 
}

Here’s the output below:

That simple!

 

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