error:Object reference not set to an instance of an object"

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I used 2 gridview and I used this code behind:

C#

protected void SAVE_bt_Click(object sender, EventArgs e)
    {
        if (Hidden_txt.Text == Convert.ToString(1))
        {
            
            for (int i = 0; i < FirstDD_gv.Rows.Count; i++)
            {
                GridViewRow row = FirstDD_gv.Rows[i];
                bool isChecked = ((CheckBox)row.FindControl("chkSelect")).Checked;

                if (isChecked)
                {

                    SqlCommand cmd = new SqlCommand();
                    cmd.Connection = new SqlConnection(Class1.CnnStr);
                    cmd.CommandText = "insert into table values(@Po_Number,@Line_No,@DelDate,@First_Sec)";
                    cmd.Connection.Open();
                    cmd.Parameters.AddWithValue("@Po_Number", PoNumber_lbl.Text);
                    cmd.Parameters.AddWithValue("@Line_No", FirstDD_gv.Rows[i].Cells[1].Text);
                    cmd.Parameters.AddWithValue("@DelDate", DeliveryDate_txt.Text);
                    cmd.Parameters.AddWithValue("@First_Sec", Hidden_txt.Text);
                    cmd.ExecuteNonQuery();

                }
            }
        }
        else
        {
           
            for (int i = 0; i < SecondDD_gv.Rows.Count; i++)
            {
                GridViewRow row = SecondDD_gv.Rows[i];
                bool isChecked = ((CheckBox)row.FindControl("chkSelect")).Checked;

                if (isChecked)
                {

                    SqlCommand cmd = new SqlCommand();
                    cmd.Connection = new SqlConnection(Class1.CnnStr);
                    cmd.CommandText = "insert into table values(@Po_Number,@Line_No,@DelDate,@First_Sec)";
                    cmd.Connection.Open();
                    cmd.Parameters.AddWithValue("@Po_Number", PoNumber_lbl.Text);
                    cmd.Parameters.AddWithValue("@Line_No", SecondDD_gv.Rows[i].Cells[1].Text);
                    cmd.Parameters.AddWithValue("@DelDate", DeliveryDate_txt.Text);
                    cmd.Parameters.AddWithValue("@First_Sec", Hidden_txt.Text);
                    cmd.ExecuteNonQuery();

                }
            }
        }


    }

depends on my hidden_txt.text that just shows one of them
when I used first gridview I don't have any problem but when I used second grid view It shows me this error:
"Object reference not set to an instance of an object"
what should I do?

Posted 26-Nov-11 23:12pm

kitykity

Updated 26-Nov-11 23:20pm

thatraja

v2

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Comments

Neema Derakhshan 27-Nov-11 5:19am

How many cells do you have in a row,in second gridView??
SecondDD_gv.Rows[i].Cells[1].Text);
check it out,Row[i] has 2 cells??

Addy Tas 27-Nov-11 5:28am

Is the exception thrown on the line:
bool isChecked = ((CheckBox)row.FindControl("chkSelect")).Checked;

If so the row does now have the checkbox control or the control does not have the name chkSelect.

3 solutions

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OriginalGriff · Answer 1 · 2011-11-26T23:18:00

The first thing to do is to find out which line is giving the error! Put a try...catch block around your method:

C#

protected void SAVE_bt_Click(object sender, EventArgs e)
     {
     try
         {
         if (Hidden_txt.Text == Convert.ToString(1))
             {
             ...
             }
         else
             {
             ...
             }
         }


     catch (Exception ex)
         {
         // Log or display ex.ToString() here
         }
     }

When you have that info, you can start to look at what might be the problem.

Ravi_Raturi · Answer 2 · 2011-11-27T00:40:00

Solution 3

Your data source and grid should have same data type. The number of rows dosen't affect.

Posted 27-Nov-11 0:40am

Ravi_Raturi

Eduard Lu · Answer 3 · 2011-11-27T00:18:00

Solution 2

Add the following codes:

C#

if(!String.IsNullOrEmpty(Hidden_txt.Text))
{
   if (Hidden_txt.Text == Convert.ToString(1))
   {
      //your code here.
   }
}

Hope it helps!

Regards,
Eduard

Posted 27-Nov-11 0:18am

Eduard Lu