SharePoint Web Services - Help Needed

[EDN Admin]

I have the following code in my asp.net app; it gives me an error on the first line:
The type or namespace WS_Lists could not be found...

<pre class="prettyprint public void getListData()
{
WS_Lists.Lists myservice = new WS_Lists.Lists();
myservice.Credentials = System.Net.CredentialCache.DefaultCredentials;
myservice.Url = "http://merdev-moss:5050/testsara/_vti_bin/Lists.asmx";
try
{
/* Assign values to pass the GetListItems method*/
string listName = "{5C65CB1A-2E1B-488A-AC07-B115CD0FC647}";
string viewName = "{75E689B4-5773-43CB-8324-58E42E1EB885}";
string rowLimit = "100";
// Instantiate an XmlDocument object
System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
System.Xml.XmlElement query = xmlDoc.CreateElement("Query");
System.Xml.XmlElement viewFields = xmlDoc.CreateElement("ViewFields");
System.Xml.XmlElement queryOptions = xmlDoc.CreateElement("QueryOptions");
/*Use CAML query*/
query.InnerXml = "<Where><Gt><FieldRef Name="ID" />" +
"<Value Type="Counter 0</Value></Gt></Where>";
viewFields.InnerXml = "<FieldRef Name="Title" />";
queryOptions.InnerXml = "";
System.Xml.XmlNode nodes = myservice.GetListItems(listName, viewName, query, viewFields, rowLimit, null, null);
foreach (System.Xml.XmlNode node in nodes)
{
if (node.Name == "rs:data")
{
for (int i = 0; i < node.ChildNodes.Count; i++)
{
if (node.ChildNodes.Name == "z:row")
{
Response.Write(node.ChildNodes.Attributes["ows_Title"].Value + "</br>");
}
}
}
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}[/code]
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