how to insert data from grid view textbox to database

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i have a 7 textbox in my grid view but when i enter value in textbox and submit then it shows an error object reference not set to an instance of an object..
here is my code

C#

for(int count = 0; count < GridView1.Rows.Count; count++)
    {
        TextBox txt1 = (TextBox)GridView1.Rows[count].FindControl("txt1");
        TextBox txt2 = (TextBox)GridView1.Rows[count].FindControl("txt2");
        TextBox txt3 = (TextBox)GridView1.Rows[count].FindControl("txt3");
        TextBox txt4 = (TextBox)GridView1.Rows[count].FindControl("txt4");

        TextBox txt5 = (TextBox)GridView1.Rows[count].FindControl("txt5");
        TextBox txt6 = (TextBox)GridView1.Rows[count].FindControl("txt6");
        TextBox txt7 = (TextBox)GridView1.Rows[count].FindControl("txt7");
       then i write connection string
           string str;
        str = "insert into leave1(pl,sl,cl,lwp,ot,night,sunday)values('" + txt1.Text + "','" + txt2.Text + "','" + txt3.Text + "','" + txt4.Text + "','" + txt5.Text + "','" + txt6.Text + "','" + txt7.Text + "')";
        SqlCommand cmd = new SqlCommand(str, con);
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
        GridView1.DataBind();
}

plz help me....where m wrong

Posted 7-Jun-12 20:59pm

Rini Agrawal

Updated 7-Jun-12 22:03pm

Sandeep Mewara

v2

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Sandeep Mewara · Answer 1 · 2012-06-07T22:05:00

Object reference not set to an instance of an object

This error happens when you try to use a property or call a method of an object that is null. More details: here[^]

A simple use of Visual studio DEBUGGER can tell you the object because of which it is happening. Just look at the stack trace and put a debugger on that line. Check the objects of that line and see if any one is null and you are trying to use that objects property. Handle the same.

Out here, the way you have coded, it should have atleast 7 rows of data and they should have textbox controls to be found. You sure it's 7 rows? Or you have 7 columns and less number of rows? Adjust and check.