Index was out of range. Must be non-negative and less than the size of the collection. System.ArgumentOutOfRangeException

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C#

ASP.NET

I try to get the id value from selected row and when i run the code i get the value or id is null. Here is my code, please help me.

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            try
            {
                if (e.CommandName == "Select")
                {
                    MultiView1.ActiveViewIndex = 1;
                    GridView1.Visible = true;

                    int index = Convert.ToInt32(e.CommandArgument.ToString());

                    string id = GridView2.DataKeys[index].Value.ToString();
                    var emp = db.tb_Employees.Where(x => x.Employee_id == id).FirstOrDefault();

                    if (emp != null)
                    {
                        text_editname.Text = emp.Name;
                        text_editaddress.Text = emp.Address;
                        text_editemail.Text = emp.Email;
                        text_editphone.Text = emp.Phone;
                        DropDownList2.SelectedValue = emp.Division_id;
                    }
                }
            }
            catch (Exception)
            { }


        }

I get :
Exception : "Index was out of range. Must be non-negative and less than the size of the collection."(System.ArgumentOutOfRangeException)