working with data grid in asp.net c#

<asp:DataGrid ID="DgList" runat="server" AutoGenerateColumns="false" OnItemCommand="DgList_ItemCommand"

OnSelectedIndexChanged="DgList_SelectedIndexChanged"><Columns><asp:BoundColumn DataField="Emp_id" Visible="false"></asp:BoundColumn><asp:BoundColumn DataField="Emp_Name" HeaderText="Emp Name"></asp:BoundColumn><asp:BoundColumn DataField="Dept_Desc" HeaderText="Dept Name"></asp:BoundColumn><asp:BoundColumn DataField="Salary" HeaderText="Salary"></asp:BoundColumn><asp:ButtonColumn CommandName="edit" HeaderText="Edit" Text="Edit"></asp:ButtonColumn><asp:ButtonColumn CommandName="del" HeaderText="Delete" Text="Delete"></asp:ButtonColumn></Columns></asp:DataGrid>
.cs
protected void DgList_SelectedIndexChanged(object sender, EventArgs e){
}

protected void DgList_ItemCommand(object source, DataGridCommandEventArgs e){

string id = e.Item.Cells[0].Text;
if (e.CommandName == "edit"){
Response.Redirect(
"EditEmp.aspx?q=" + id);}

if (e.CommandName == "del"){
Delete(id);
}
}