C# simple calculator help, how do I create a error message to appear if they for example enter letters instead of numbers ? I would create another text box I know but
C# MessageBox.Show Examples - Dot Net Perls
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Visual Studio C#: Insert data into Access error : r/csharp
How to show Error & Warning Message Box in .NET | C# MessageBox.Show Examples « Asp.Net,MVC,C#.Net,VB.Net,Windows Application,WPF,Javascript,jQuery,HTML,Tips and Tricks,GridView
Static Class Example C# – Creating a custom messagebox. | ian.NET