how to resolve this error

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C#

protected void lnk_Click(object sender, EventArgs e)
        {
            string connection = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(connection);

            List<int> list = new List<int>();
            for (int i = 0; i < 11; i++)
            {
                StringCollection sc = new StringCollection();
                TextBox txtCollection = (TextBox)Page.FindControl("txt" + i);

                sc.Add(txtCollection.Text);                
           }

Posted 26-Jul-12 21:37pm

2011999

Updated 26-Jul-12 23:44pm

Prasad_Kulkarni

v5

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Sebastian T Xavier 27-Jul-12 3:37am

What? When? How?

Sebastian T Xavier 27-Jul-12 3:39am

Did you debug the code? From which line you are getting exception?

2011999 27-Jul-12 4:08am

sc.Add(txtCollection.Text);

Sebastian T Xavier 27-Jul-12 4:59am

I didn't see that line from your code

vvsnmurty 27-Jul-12 5:51am

what is the id of ur finding
textbox

pradiprenushe 27-Jul-12 5:53am

what exception do you get?

2011999 27-Jul-12 6:08am

Object reference not set to an instance of an object.

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-07-26T21:43:00

This is one of the easiest problems, it simply means that you are de-referencing some reference which is null at that point, but it is not supposed to be null. Just run it under debugger and analyze the statement causing the exception, run it again and check all expressions involved for null. When you find it, fix it: either make sure the object is initialized before use, or check for null and don't do the operation causing exception in case of null.

Next time, provide comprehensive exception information, complete with the line of code where the exception is thrown. And always use the debugger before asking questions like that.

—SA

Dan Steuer · Answer 2 · 2012-07-27T02:52:00

Well, I cannot see your html so this is just speculation on my part...
Do you have 11 TextBox controls named txt0, txt1, txt2, txt3, txt4, txt5, txt6, txt7, txt8, txt9, and txt10?

I notice you are starting you i at 0 not 1 so you must have a txt0.

And they must be named exactly "txt" + all options of i or you will get a null Object error like you have gotten.

Another note in the code, maybe you have stripped something out but:

C#

StringCollection sc = new StringCollection();

This is declared inside of the for block and will not be available for use after it closes. I do not see you doing anything with it in the code given so I must assume you intend to do something with it after the for loop, so you need to declare the sc variable before you open the for loop.

This is variable "scope" and right now the scope is only the for loop itself.

how to resolve this error

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