using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; namespace BrowserMouseClick { public partial class Form1 : Form {      [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]      static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);      [DllImport("user32.dll", SetLastError = true)]      static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);      [DllImport("user32.dll", CharSet = CharSet.Auto)]      static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);      public Form1()      {          InitializeComponent();      }      private void Form1_Load(object sender, EventArgs e)      {          webBrowser1.Navigate("http://www.devpub.com");      }      private void btnMouseClick_Click(object sender, EventArgs e)      {          int x = 100; // X coordinate of the click          int y = 80; // Y coordinate of the click          IntPtr handle = webBrowser1.Handle;          StringBuilder className = new StringBuilder(100);          while (className.ToString() != "Internet Explorer_Server") // The class control for the browser          {              handle = GetWindow(handle, 5); // Get a handle to the child window              GetClassName(handle, className, className.Capacity);          }          IntPtr lParam = (IntPtr)((y << 16) | x); // The coordinates          IntPtr wParam = IntPtr.Zero; // Additional parameters for the click (e.g. Ctrl)          const uint downCode = 0x201; // Left click down code          const uint upCode = 0x202; // Left click up code          SendMessage(handle, downCode, wParam, lParam); // Mouse button down          SendMessage(handle, upCode, wParam, lParam); // Mouse button up      } } }