How Do I Update Records In Microsoft Dynamics Nav From C#

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C#

ASP.NET

can anyone tell me how to update records in microsoft dynamics NAV classics from c# asp.net... I have imported all the services to c# and tried following ways..

LeaveRequestCard_Binding LeaveRequest_Serv = new LeaveRequestCard_Binding();
var NewLeaveRequest = new LeaveRequestCard();
LeaveRequest_Serv.Credentials = new NetworkCredential(G_UserName, G_PassWord, G_Domain);
LeaveRequest_Serv.Read(leaveRequestNo);
string no= NewLeaveRequest.Leave_Request_No;
LeaveRequest_Serv.Update(ref NewLeaveRequest);


this is not at all working.. any help