I am working In dotNet Framework 3.5 ASP.NET C#. I want to create Campaign in Microsoft AdCenter API Version 6.0. For that I reffered the website 'http://msdn.microsoft.com/en-us/library/bb671919.aspx'. I created the same example with different Campaign Name (because campaign name is unique). But I got the error message 'Invalid client data. Check the SOAP fault details for more information'. Can any body help me to fix this error. Please this is some urgent one.