Please corrct this error Exeception

Question

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SQL-server-2000

SQL-Server-2005

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Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 136:
Line 137: //currentTitleOfCourtesy = ((TextBox)r.FindControl("TitleOfCourtesyTextBox")).Text;
Line 138: currentLastName = ((TextBox)r.FindControl("Name")).Text;
Line 139: currentFirstName = ((TextBox)r.FindControl("Location")).Text;
Line 140: //currentTitle = ((TextBox)r.FindControl("TitleTextBox")).Text;

I got Error Near The line

currentLastName = ((TextBox)r.FindControl("Name")).Text;

Thanks for your advance replay

Posted 25-Nov-11 5:30am

2011999

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Sergey Alexandrovich Kryukov 25-Nov-11 11:46am

Why using FindControl at all? Such an abuse...
--SA

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Timberbird · Answer 1 · 2011-11-25T05:37:00

Solution 2

You don't have a control with ID "Name" on your r control, whatever this r is. Ensure you have TextBox with ID="Name" on r and, if you do, view page source in the browser - ID could change if you use master pages

Posted 25-Nov-11 5:37am

Timberbird

minaxi.patel · Answer 2 · 2011-11-25T05:37:00

hi....

here I think if You are trying to set text before binding your control that may give that error

just try this code after binding your control.

C#

int i = 0;
        foreach (GridViewRow row in GridView1.Rows)
        {
                ((TextBox)row.FindControl("TextBox1")).Text = "Hello";
         

            i++;
        }

This will work perfectly

Sergey Alexandrovich Kryukov · Answer 3 · 2011-11-25T05:45:00

Using FindControl is generally bad and unreliable.

What happens if you misspell a name? A compiler won't find any errors. In a normally designed application you never need to find a control, because you have all the variables in your form classes. At least check up found control for null before using the found reference. You problem is just an attempt to operate on found control when its reference is null.

—SA

RaisKazi · Answer 4 · 2011-11-25T07:30:00

Well, First tell us what is r? Based on that it would be easier to rectify, if you are making valid use of FindControl or not.

If I assume you are making valid use of FindControl
then you may put a condition to check null as below.

C#

if(r != null && r.FindControl("Name") != null)
{
  currentLastName = ((TextBox)r.FindControl("Name")).Text;
}

Please corrct this error Exeception

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