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POHow to implement a web service in ASP.NET
 

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    <p>I'm a fairly new programmer and very new to web programming and I need some ASP.NET remediation. I'm trying to implement an autocomplete control in a form. When I put the search logic in the form codebehind, everything works. However, once I move the search logic to a web service (the autocomplete is still calling the same method in the form code), everything goes screwy. I'm using an OleDb connection and trying to access a test db on my workstation, but I get an error saying that the server is inaccessible.</p> <p>Obviously, I could stick with the aspx codebehind, but regardless I need to understand the basic workings of a web service. Can someone help me understand where I'm making the error?</p> <p>What I have looks like this:</p> <h2>Form.aspx.cs</h2> <pre><code> ... [System.Web.Services.WebMethod] [System.Web.Script.Services.ScriptMethod] public static string[] GetContacts(string prefixText, int count) { AutoCompleteService autoCompleteService = new AutoCompleteService(); autoCompleteService.QueryString = "SELECT ..."; autoCompleteService.ConnectionString = UserContext.ConnectionString; return autoCompleteService.GetResults(prefixText, count); } ... </code></pre> <h2>AutoComplete.Service.asmx</h2> <pre><code>&lt;%@ WebService Language="C#" CodeBehind="AutoComplete.Service.cs" Class="AutoCompleteService" %&gt; </code></pre> <h2>AutoComplete.Service.cs</h2> <pre><code>using System; using System.Collections.Generic; using System.Web; using System.Web.Services; using System.Data.OleDb; using System.Data; [WebService(Namespace = "http://tempuri.org/")] [System.Web.Script.Services.ScriptService] public class AutoCompleteService : System.Web.Services.WebService { public string QueryString; public string ConnectionString; public AutoCompleteService() { QueryString = ""; ConnectionString = ""; } [WebMethod] public String[] GetResults(string prefixText, int count) { ... } private String[] GetNameListFromDB() { List&lt;string&gt; resultList = new List&lt;string&gt;(); OleDbConnection connection = new OleDbConnection(ConnectionString); connection.Open(); //Exception thrown here. ... } </code></pre> <h2>Exception</h2> <pre><code>ServerVersion = 'connection.ServerVersion' threw an exception of type 'System.InvalidOperationException' </code></pre>
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