Here by I am trying to give you a sample code for moving the win form by clicking the mouse.
Just use the following code and test it.
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
public static extern int SendMessage(IntPtr hWnd,int Msg, int wParam, int lParam);
public static extern bool ReleaseCapture();
private void Form1_MouseDown(object sender, MouseEventArgs e)
if (e.Button == MouseButtons.Left)
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
Now you can implement the above code in your application and test it. Working fine for me