ASP .NET RowUpdating GridView Troubles

Question

I'm having trouble with the RowUpdating Method. My GridView is connected to our local SQL Server, and I'm trying to update the data. Here is the code for the RowUpdating Method from MSDN.

protected void TaskGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
        //Retrieve the table from the session object.
        DataTable dt = (DataTable)Session["TaskTable"];

        //Update the values.
        GridViewRow row = GridView1.Rows[e.RowIndex];
        dt.Rows[row.DataItemIndex]["Id"] = ((TextBox)(row.Cells[1].Controls[0])).Text;
        dt.Rows[row.DataItemIndex]["Description"] = ((TextBox)(row.Cells[2].Controls[0])).Text;
        dt.Rows[row.DataItemIndex]["IsComplete"] = ((CheckBox)(row.Cells[3].Controls[0])).Checked;

        //Reset the edit index.
        GridView1.EditIndex = -1;

        //Bind data to the GridView control.
        BindData();

}

I get this error:

System.NullReferenceException: Object reference not set to an instance of an object.

Answer 1

try this code once.

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
    int id = Int32.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString());
    TextBox tname = (TextBox)row.FindControl("nam");
    TextBox tques = (TextBox)row.FindControl("que");
    MySqlCommand cmd = new MySqlCommand("update exam set name1=@name,ques=@ques where id = @id", con);
    cmd.Parameters.Add("@id", MySqlDbType.Int16).Value = id;
    cmd.Parameters.Add("@name", MySqlDbType.VarChar, 30).Value = tname.Text.Trim();
    cmd.Parameters.Add("@ques", MySqlDbType.VarChar,40).Value = tques.Text.Trim();
    con.Open();
    cmd.ExecuteNonQuery();
    GridView1.EditIndex = -1;
    bind();
}