![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# 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](https://preview.redd.it/cb7emvc3flf41.jpg?auto=webp&s=6e3b8f4d3d03662d65ba4c79c3e4945917d23267)
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
![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 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](https://4.bp.blogspot.com/-TwJC1DXkjqM/U4DhONKplgI/AAAAAAAADdc/r-zU8NQRUZA/s1600/Screenshot_4.png)
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
![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 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](https://4.bp.blogspot.com/-7Jp9NNJlIiI/U4Dcg612bWI/AAAAAAAADco/WjGE_8kjJt0/s1600/Screenshot_1.png)