SoapException

I am having difficulty consuming a Web Service from a C# Pocket PC
application. I receive the message:

***
An unhandled exception of type
'System.Web.Services.Protocols.SoapException' occurred in
System.Web.Services.dll

Additional information: Server was unable to process request. --> Object
reference not set to an instance of an object.
***

This is an excerpt from my Web Service (which runs on an ISP and I cannot
remotely debug):

[WebMethod]
public String PutStaticData(DataSet staticDataSet)
{
try
{
// do some SQL Server Stuff

return null;
}
catch (SqlException e)
{
return e.Message.ToString();
}
}
[WebMethod]
public String PutUserData(DataSet userDataSet)
{
try
{
// do some SQL Server Stuff

return null;
}
catch (SqlException e)
{
return e.Message.ToString();
}
catch (SoapException f)
{
return f.Message.ToString();
}
}
*****
C# Pocket PC App -- Code Snippet
function
{
String returnValue=null;
DataSet txnDataSet = new DataSet();

try
{
// Load txnDataSet using SqlDataAdapter
SyncServices.Service1 ss = new SyncServices.Service1();
returnValue = ss.PutUserData(txnDataSet);
***** This call fails with above message *****
}
catch
......
}

function
{
String returnValue=null;
DataSet staticDataSet = new DataSet();

try
{
// Load staticDataSet using SqlDataAdapter
SyncServices.Service1 ss = new SyncServices.Service1();
returnValue = ss.PutStaticData(staticDataSet);
***** This call succeeds *****
}
catch
.....
}

Since the exception is unhandled, and I have a catch statement for this
exception, I am assuming that it never actually gets far enough to execute
my Web Service code.

Any ideas?

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.

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