(Forum answer bit) How do you use DataKeys to locate records in a DataGrid with a combination of primary keys?

Datagrid

Like three fields in a table
Key1 int,key2 Int,item varchar (50)
Front 2 Fields Union primary key

Foreground code:

<asp:datagrid id= "DATAGRID1" runat= "Server" autogeneratecolumns= "False" datakeyfield= "Doublekey" >
<Columns>
<asp:boundcolumn datafield= "Item" headertext= "Item" ></asp:BoundColumn>
<asp:buttoncolumn commandname= "del" text= "delete" ></asp:ButtonColumn>
</Columns>
</asp:DataGrid>

Background code:

Using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Data;
Using System.Data.SqlClient;
Using System.Drawing;
Using System.Web;
Using System.Web.SessionState;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.HtmlControls;

Namespace CSDN2
{
public class WebForm20:System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load (object sender, System.EventArgs e)
{
if (! IsPostBack)
{
Setbind ();
}
}
private void Setbind ()
{
SqlConnection conn=new SqlConnection (system.configuration.configurationsettings.appsettings["Conn"));
SqlDataAdapter Da=new SqlDataAdapter ("select * from Doublekey", conn);
DataSet ds=new DataSet ();
Da. Fill (DS);
DataTable Dt=ds. Tables[0];
DataColumn dc=new DataColumn ("Doublekey", typeof (String), "key1+ ' # ' +key2");
Dt. Columns.Add (DC);
This. DATAGRID1.DATASOURCE=DT;
This. Datagrid1.databind ();
}
Web Forms Designer generated Code #region Web Forms Designer generated code
Override protected void OnInit (EventArgs e)
{
//
CodeGen: This call is required for the ASP.net Web forms Designer.
//
InitializeComponent ();
Base. OnInit (e);
}

/**////<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</summary>
private void InitializeComponent ()
{
This. Datagrid1.itemcommand + = new System.Web.UI.WebControls.DataGridCommandEventHandler (this. Datagrid1_itemcommand);
This. Load + = new System.EventHandler (this. Page_Load);

}
#endregion

private void Datagrid1_itemcommand (object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
if (e.commandname== "Del")
{
SqlConnection conn=new SqlConnection (system.configuration.configurationsettings.appsettings["Conn"));
SqlCommand comm=new SqlCommand ("Delete from Doublekey where key1= @key1 and key2= @key2", conn);
SqlParameter parm1=new SqlParameter ("@key1", SqlDbType.Int);
SqlParameter parm2=new SqlParameter ("@key2", SqlDbType.Int);
string [] keys=this. Datagrid1.datakeys[e.item.itemindex]. ToString (). Split (' # ');
Parm1. Value=keys[0];
Parm2. VALUE=KEYS[1];
Comm. Parameters.Add (PARM1);
Comm. Parameters.Add (PARM2);
Conn. Open ();
Comm. ExecuteNonQuery ();
Conn. Close ();
Setbind ();
}
}
}
}