Question

The problem is I can access the value from a certain row only from the next row.
Here is the code:

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            int s = GridView1.EditIndex;
            string constr = "con string";
            string statment = "Select Name from tb1 Where [ID] = " + s;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand comm = new SqlCommand(statment, con))
                {
                    con.Open();
                    Label2.Text = comm.ExecuteScalar().ToString();
                    con.Close();
                }
            }
        }

For example:

                   ID   Name
Edit Delete Select  1   JOhn 
Edit Delete Select  2   SMith

• If I click edit and update on the first row I get this :

  Object reference not set to an instance of an object.

• If I click edit and update on the second row , I get the value from
  the first row.

Is there any way to fix this?

Answer 1

Change int sd = GridView1.EditIndex; to int sd = GridView1.EditIndex + 1;

A better method would be to use the datakeynames property of the gridview.

Setting datakeyname="id" on the gridview will allow you to retrieve the Id with int Id = Convert.ToInt32(GridView1.DataKeys[Gridview1.EditIndex].Values[0])

This will use less overhead than creating an object and setting it to a control in the row containing the id to retrieve it’s value. See link for further reading on implementing datakeynames.

I would also recommend using a System.Data.SqlClient.SqlCommand for the SQL method and adding the Id via a parameter. This would help guard against an injection attack.