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Updating a gridview populated with a datatable

I have a page that has the gridview below. I am populating this gridview with a dataTable. I run a stored procedure
 that performs a search. I will like to update any row once my result is displayed in the grid.
 How can I do that?
 Here is my gridview below:

    <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" AutoGenerateEditButton="true" DataKeyNames="staffid" >
         <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
         <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
         <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
         <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
         <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
         <AlternatingRowStyle BackColor="White" />
         <asp:SqlDataSource ID="SqlDataSource1" runat="server"></asp:SqlDataSource>

  Here is my asp.net code
           SqlDataAdapter da = new SqlDataAdapter("SamplePerformSearch", cn);
            da.SelectCommand.CommandType = CommandType.StoredProcedure;
            da.SelectCommand.Parameters.Add(new SqlParameter("@StaffID", SqlDbType.VarChar, 4));
            da.SelectCommand.Parameters["@StaffID"].Value = txtStaffID.Text;

            da.SelectCommand.Parameters.Add(new SqlParameter("@LastName", SqlDbType.VarChar, 30));
            da.SelectCommand.Parameters["@LastName"].Value = txtLastName.Text;

            da.SelectCommand.Parameters.Add(new SqlParameter("@FirstName", SqlDbType.VarChar, 30));
            da.SelectCommand.Parameters["@FirstName"].Value = txtFirstName.Text;

            DataTable dt = new DataTable();
            GridView1.DataSource = dt;
  my search result only returns staffid, lastname, firstname, address.
  I want to be able to Edit and update lastname,firstname and address from the gridview.

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1 Solution
Have a read of 4Guys article on the datagrid, it details everything you want to do over the 18 parts:

SirdotsAuthor Commented:
Thanks Goggy.  I am using a gridview and not a datagrid. [visual studio 2005]
I know mate, but a lot of the properties and events are the same/similar, and their article is comprehensive, it should help you.
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