Resolving the System.InvalidOperationException in C# Winforms SQL Server Connections

Resolving the System.InvalidOperationException in C# Winforms SQL Server Connections

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How to fix The connection was not closed error in Visual Studio C#.NET Final Project?
How to fix The connection was not closed error in Visual Studio C#.NET Final Project?
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How to fix The connection was not closed error in Visual Studio C#.NET Final Project?

How to fix The connection was not closed error in Visual Studio C#.NET Final Project?
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