Common Causes of Null Reference Error When Accessing Selected Item from a ListBox in ASP.NET

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Fix: System.NullReferenceException : object reference not set to instance of an object ASP.NET CORE Fix: System.NullReferenceException : object reference not set to instance of an object ASP.NET CORE
System.Windows.Forms.ListBox.SelectedItem.get returned null: Object reference not set to an instance System.Windows.Forms.ListBox.SelectedItem.get returned null: Object reference not set to an instance
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This is how you get rid of null reference exceptions forever This is how you get rid of null reference exceptions forever