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Private Sub FindCoords()

Dim pMxdoc As IMxDocument
Set pMxdoc = ThisDocument

Dim pMap As IMap
Set pMap = pMxdoc.FocusMap

Dim pAct As IActiveView
Set pAct = pMap

Dim pEnv As IEnvelope
Set pEnv = pAct.Extent

Dim xMin As Double
Dim yMin As Double
Dim xMax As Double
Dim yMax As Double

xMin = pEnv.xMin
yMin = pEnv.yMin
xMax = pEnv.xMax
yMax = pEnv.yMax

Dim strBottomLeft As String
strBottomLeft = xMin & "," & yMin

Dim strBottomRight As String
strBottomRight = xMax & "," & yMin

Dim strTopLeft As String
strTopLeft = xMin & "," & yMax

Dim strTopRight As String
strTopRight = xMax & "," & yMax

End Sub

public class Utils
{
	public static void ShowActiveViewScreenCordinates(IMxDocument mxDocument) 
	{
		User32.WinRect rect = new User32.WinRect();
		User32.GetWindowRect(mxDocument.ActiveView.ScreenDisplay.hWnd, ref rect);
		string message = "Top:\t" + rect.Top + "\nLeft:\t" + rect.Left;
		message += "\nRight:\t" + rect.Right + "\nBottom:\t" + rect.Bottom;
		MessageBox.Show(message);
	}
	
	public static User32.WinRect GetActiveViewScreenCordinates(IMxDocument mxDocument) 
	{
		User32.WinRect rect = new User32.WinRect();
		User32.GetWindowRect(mxDocument.ActiveView.ScreenDisplay.hWnd, ref rect);
		return rect;
	}
}

/// <summary>
/// Helper class containing User32 API functions
/// </summary>
public class User32
{
	[StructLayout(LayoutKind.Sequential)]
	public struct WinRect
	{
		public int Left;
		public int Top;
		public int Right;
		public int Bottom;
	}
	
	[DllImport("user32.dll")]
	public static extern int GetDesktopWindow();
	[DllImport("user32.dll")]
	public static extern int GetWindowDC(int hWnd);
	[DllImport("user32.dll")]
	public static extern int ReleaseDC(int hWnd,int hDC);
	[DllImport("user32.dll")]
	public static extern int GetWindowRect(int hWnd,ref WinRect rect);
}