C# Archives - Page 142 of 143

Is there a reason for C#’s reuse of the variable in a foreach?

When using lambda expressions or anonymous methods in C#, we have to be wary of the access to modified closure pitfall. For example: ...

April 10, 2022
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Proper use of the IDisposable interface

I know from reading the Microsoft documentation that the “primary” use of the IDisposable interface is to clean up unmanaged resources. To me, ...

April 10, 2022
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What do two question marks together mean in C#?

Ran across this line of code: FormsAuth = formsAuth ?? new FormsAuthenticationWrapper(); What do the two question marks mean, is it some kind ...

April 10, 2022
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What is a NullReferenceException, and how do I fix it?

This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. ...

April 10, 2022
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How do I remedy “The breakpoint will not currently be hit. No symbols have been loaded for this document.” warning?

A C# desktop application (on the Visual Studio Express/Community edition) worked, but then it didn’t work 5 seconds later. I tried the following: ...

April 10, 2022
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How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?

How can I create an Excel spreadsheet with C# without requiring Excel to be installed on the machine that’s running the code? 4 ...

April 10, 2022
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How do I calculate someone’s age based on a DateTime type birthday?

Given a DateTime representing a person’s birthday, How do I calculate their age in years? 70 70

April 10, 2022
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Get int value from enum in C#

I have a class called Questions (plural). In this class there is an enum called Question (singular) which looks like this. public enum ...

April 10, 2022
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What is the best way to give a C# auto-property an initial value?

How do you give a C# auto-property an initial value? I either use the constructor, or revert to the old syntax. Using the ...

April 10, 2022
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How do I generate a random int number?

How do I generate a random integer in C#? 3 32

April 10, 2022
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