Creating Own MessageBox in Windows Form Application:
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How to use own created MessageBox control in another Windows Form application
To find your existing .cs files, right click on the project in your instance of Visual Studio, and click Open Folder in File Explorer.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
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using CustomMsgBox; //Here's the using statement for our dependency.