C# Signature:

[DllImport("user32.dll", SetLastError=true)]
static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

VB Signature:

Declare Sub SwitchToThisWindow Lib "user32.dll" ( _
   hWnd As IntPtr, fAltTab As Boolean)

Notes:

Set fAltTab to true if you want it to work well for switching between applications. Otherwise won't work if application you're switching to is minimized.

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Sample Code:

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Alternative Managed API:

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