Winsock Component - Using in C#

Sending e-mail, using OstroSoft Winsock Component (OSWinsock.dll)
Download project source code

Minimum requirements: C#, OSWinsock.dll*
* If you don't have OstroSoft Winsock Component, see installation instructions

1. In Visual Studio.NET create new C# Windows Application
2. Click on Project menu and select "Add Reference"
3. In "Add Reference" dialog box click on COM tab and select OSWinsock. Click OK to save a new reference.
4. Enter the following code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace oswinsck_csharp
{
  public class frmMain : System.Windows.Forms.Form
  {
    internal System.Windows.Forms.Button cmdView;
    internal System.Windows.Forms.TextBox txtSource;
    internal System.Windows.Forms.TextBox txtURL;
    internal System.Windows.Forms.Label Label1;
    internal System.Windows.Forms.CheckBox chkProxy;
    internal System.Windows.Forms.TextBox txtProxy;

    private System.ComponentModel.Container components = null;

    public frmMain()
    {
      InitializeComponent();
    }

    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }

    Windows Form Designer generated code

    [STAThread]
    static void Main() 
    {
      Application.Run(new frmMain());
    }

    private void cmdView_Click(object sender, System.EventArgs e)
    {
      int nPort = 80;
      string sSource = "";
      string sRequest = "";
      string sPage = "";
      string sServer = "";
      int nConnected = 0;

      if (txtURL.Text != "") 
      {
        sServer = txtURL.Text;
        if (sServer.IndexOf("://") > 0)
          sServer = sServer.Substring(sServer.IndexOf("://") + 3);
        if (sServer.IndexOf("/") > 1) 
        {
          sPage = sServer.Substring(sServer.IndexOf("/"));
          sServer = sServer.Substring(0, sServer.IndexOf("/"));
          if (sPage.IndexOf("#") > 1 )
            sPage = sPage.Substring(0, sPage.IndexOf("#"));
        } 
        else
          sPage = "/";

        if (sServer.IndexOf(":") > 1) {
          nPort = 
            Convert.ToInt32(sServer.Substring(sServer.IndexOf(":", 0)));
          sServer = sServer.Substring(0, sServer.IndexOf(":"));
        }

        OSWINSCK.TCP wsTCP = new OSWINSCK.TCP();

        if (txtProxy.Text != "") 
        {
          sRequest = "GET http://" + sServer + sPage + " HTTP/1.0\r\n";
          nConnected = wsTCP.Connect(txtProxy.Text, 80);
        }
        else
        {
          sRequest = "GET " + sPage + " HTTP/1.0\r\n";
          nConnected = wsTCP.Connect(sServer, nPort);
        }

        if (nConnected == 0) {
          wsTCP.SendData (sRequest + "\r\n");
          wsTCP.Sleep (1000);
          sSource = wsTCP.GetData();
          wsTCP.Disconnect();
        }

        wsTCP = null;
        txtSource.Text=sSource;
      }
    }
  }
}