I am attempting to create a web form that uses a web service to search a 
database.  The web form has a dropdownlist that is populated by the 
service. I want to be able to select an item from the dropdownlist and 
have it refresh the page, still showing the selected item in the 
dropdownlist and now showing a datagrid of additional information, 
specific to the selection. No datagrid shows until an item is selected 
from the dropdownlist.

I am using VS.Net C#, latest production release. I am using a 
dropdownlist, a dataview, a dataset, and a datagrid.  What I get is the 
dropdownlist to populate and I get the complete list of items in the 
datagrid.  There is no connection between by dropdown and the datagrid. 
When I select an item in the dropdown, the page refreshes back to the 
original first item in the dropdown list ( I have the AutoPostBack set to 
true on the dropdown)  

HELP!!

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
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 SearchClientNXT
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DropDownList 
DropDownList1;
		protected SearchClientNXT.localhost.dsClaimInfo 
dsClaimInfo1;
		protected System.Data.DataView DataView1;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
				SearchClientNXT.localhost.Service1 ws = 
			 new SearchClientNXT.localhost.Service1();
			ws.Credentials = 
System.Net.CredentialCache.DefaultCredentials;
			dsClaimInfo1.Merge(ws.GetClaim());
//GetClaim method queries DB and returns 2 columns: NUM_CLM and CLMNT 
			DropDownList1.DataBind();
			if (!IsPostBack)
			{
				DataGrid1.DataBind();	
			}
			
        			
		}
		
		
			

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET 
Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.dsClaimInfo1 = new 
SearchClientNXT.localhost.dsClaimInfo();
			this.DataView1 = new System.Data.DataView();
			((System.ComponentModel.ISupportInitialize)
(this.dsClaimInfo1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)
(this.DataView1)).BeginInit();
			// 
			// dsClaimInfo1
			// 
			this.dsClaimInfo1.DataSetName = "dsClaimInfo";
			this.dsClaimInfo1.Locale = new 
System.Globalization.CultureInfo("en-US");
			this.dsClaimInfo1.Namespace 
= "http://www.tempuri.org/dsClaimInfo.xsd";
			// 
			// DataView1
			// 
			this.DataView1.RowFilter = "NUM_CLM like \'%\'";
			this.DataView1.Table = this.dsClaimInfo1.LLXCLAMT;
			this.Load += new System.EventHandler
(this.Page_Load);
			((System.ComponentModel.ISupportInitialize)
(this.dsClaimInfo1)).EndInit();
			((System.ComponentModel.ISupportInitialize)
(this.DataView1)).EndInit();

		}
		#endregion

	
	}
}

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Did you try putting this :

 DropDownList1.DataBind();

inside 

 if (!IsPostBack) {

}

?