Object reference not set to an instance of an object

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Hi friends,
I have a gridview which show datas from sql, i wrote code for it who run it load datas from sql to gridview and it worked truly but after i fix header for it, it couldn't show some of columns. i want when i select a row it show me into textbox but i get error for cells are empty.
Could you help me?

C#

private void ContactGrid_RowStateChanged(object sender, DataGridViewRowStateChangedEventArgs e)
       {
           if (ContactGrid.SelectedRows.Count == 1)
           {
               int index = e.Row.Index;
               txtContactId.Text = ContactGrid.Rows[index].Cells[0].Value.ToString();
               txtContactName.Text = ContactGrid.Rows[index].Cells[1].Value.ToString();
               txtContactFamily.Text = ContactGrid.Rows[index].Cells[2].Value.ToString();
               txtContactAddress.Text = ContactGrid.Rows[index].Cells[3].Value.ToString();
               txtContactPhoneNumber.Text = ContactGrid.Rows[index].Cells[4].Value.ToString();
               txtContactBirthDate.Text = ContactGrid.Rows[index].Cells[5].Value.ToString();
               txtContactEmailAddress.Text = ContactGrid.Rows[index].Cells[6].Value.ToString();
               txtContactFasebookAddress.Text = ContactGrid.Rows[index].Cells[7].Value.ToString();

           }

cells from address and facebook are empty. and i get error for these.

Posted 24-Sep-13 20:51pm

Elham.Deljooei

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Eduard Keilholz · Answer 1 · 2013-09-24T20:54:00

Solution 1

Remove the Value property :

C#

ContactGrid.Rows[index].Cells[3].ToString();

The value in your database is null (or DbNull) on which you cannot perform a ToString()

Posted 24-Sep-13 20:54pm

Eduard Keilholz

Comments

Elham.Deljooei 25-Sep-13 3:11am

Hi friend,
Why cell address can't fill from sql?

Er Daljeet Singh 25-Sep-13 3:58am

How you are binding the data with gridview.You are binding the data manually or using the SqlDataSourceControl