dovoliť si zrejmý zobraziť eror box in csharp zaobchádzať samozrejme kytice
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visual c# .net - checking for blank textboxes
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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
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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
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visual c# .net - checking for blank textboxes
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Error Provider to validate the text in a TextBox : Validation « GUI Windows Form « C# / C Sharp
c# - How to show a custom error or warning message box in .NET Winforms? - Stack Overflow