[Solved] Dynamically set focus to another program in C#

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You can add reference to Microsoft.VisualBasic and try AppActivate

Microsoft.VisualBasic.Interaction.AppActivate("Visual");

Update

AppActivate finds only main windows whose title starts with the title parameter (the title parameter needs at least 3 characters), but the Visual Studio main window title is usually something like Solution Name - Microsoft Visual Studio, so you can either use the solution name or :

var processes = Process.GetProcessesByName("devenv");
if(processes.Any()) 
    Microsoft.VisualBasic.Interaction.AppActivate(processes[0].MainWindowTitle);

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solved Dynamically set focus to another program in C#