Error while calling a Webservice

See more:

ASP.NET

webservice

Sir,
I am using below code to call the web service:

ApplicationItemEx[] items = proxy.GetApplicationsByCredentialsEx(credentials, Request.UserHostName, Request.UserHostAddress, new string[] { "icon", "icon-info" }, new string[] { "all" }, new string[] { "all" });

But the above declaration i use to call the webservice gives me an error shown below:

Error:
System.Web.Services.Protocols.SoapException: Server did not recognize the value of HTTP Header SOAPAction:

Please let me know is there any another way to call the web service? Why I am getting this error?

-Basheer