C# 2008 Programmer's Reference

using System.Web.Script.Services;
/// <summary>
/// Summary description for WebService /// </summary>
[WebService(Namespace = 'http://tempuri.org/')]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {
 ...
 ...
}

Define the following two web methods:

[WebMethod]
public bool SaveSignature(string value) {
 try {
  File.WriteAllText(Server.MapPath('.') +
   @'Signature.txt', value);
  return true;
 } catch (Exception ex) {
  return false;
 }
}
[WebMethod]
public string GetSignature() {
 string fileContents;
 fileContents = File.ReadAllText(
  Server.MapPath('.') + @'Signature.txt');
 return fileContents;
}

The SaveSignature() function saves the values of the signature into a text file. The GetSignature() function reads the content of the text file and returns the content to the caller.

In the Signature project, add a service reference (see Figure 19-75).

Figure 19-75

Click the Discover button and then OK (see Figure 19-76).

Figure 19-76

In Page.xaml.cs, modify the Save button as follows:

//---Save button---
void btnSave_MouseLeftButtonDown(
 object sender, MouseButtonEventArgs e) {
 try {
  ServiceReference1.WebServiceSoapClient ws = new
   Signature.ServiceReference1.WebServiceSoapClient();
  //---wire up the event handler when the web service returns---
  ws.SaveSignatureCompleted += new

   EventHandler<Signature.ServiceReference1.SaveSignatureCompletedEventArgs> (ws_SaveSignatureCompleted);

  //---calls the web service method---
  ws.SaveSignatureAsync(GetSignatureLines());

 } catch (Exception ex) {

  txtStatus.Text = ex.ToString();
 }
}

Here, you send the signature to the Web service asynchronously. When the Web Service call returns, the ws_SaveSignatureCompleted event handler will be called.

Code the ws_SaveSignatureCompleted event handler as follows:

void ws_SaveSignatureCompleted( object sender,
 Signature.ServiceReference1.SaveSignatureCompletedEventArgs e) {
 txtStatus.Text = 'Signature sent to WS!';
}

In Page.xaml.cs, code the Load button as follows:

//---Load button---
void btnLoad_MouseLeftButtonDown(
 object sender, MouseButtonEventArgs e) {
 try {
  ServiceReference1.WebServiceSoapClient ws = new
   Signature.ServiceReference1.WebServiceSoapClient();
  //---wire up the event handler when the web service
  // returns---
  ws.GetSignatureCompleted +=
   new EventHandler<Signature.ServiceReference1.GetSignatureCompletedEventArgs> (ws_GetSignatureCompleted);
  //---calls the web service method---
  ws.GetSignatureAsync();

 } catch (Exception ex) {

  txtStatus.Text = ex.ToString();
 }
}

Here, you call the Web service to retrieve the saved signature. When the Web Service call returns, the ws_GetSignatureCompleted event handler will be called.

Code the ws_GetSignatureCompleted event handler as follows:

void ws_GetSignatureCompleted( object sender,
 Signature.ServiceReference1.GetSignatureCompletedEventArgs e) {
 txtStatus.Text = 'Signature loaded from WS!';
 DrawSignature(e.Result);
}

Save the Signature project. In Solution Explorer, right-click on the SignatureWebSite project and select Add Silverlight Link (see Figure 19-77).

Figure 19-77

This causes Visual Studio 2008 to copy the relevant files from the Silverlight project onto the current project. Use the default values populated and click Add (see Figure 19-78).

Figure 19-78