Using a variable name used in a child scope

This question already has an answer here:

C# variable scoping: 'x' cannot be declared in this scope because it would give a different meaning to 'x' 3 answers

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It is a design choice made by the designers of C#. It reduces potential ambiguity.

You can use it in one of the two places, inside the if or outside, but you can only define it in one place. Otherwise, you get a compiler error, as you found.

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Something I noticed that was not noted here. This will compile:

for (int i = 0; i < 10; i++)
{
    int a = i * 2;
}
for (int i = 0; i < 5; i++)
{
    int b = i * 2;
}

Taken together, these design decisions seem inconsistent, or at least oddly restrictive and permissive, respectively.

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As Adam Crossland said, it's a design choice - Made to make sure you (or more likely, your fellow developers) dont misunderstand the code.

You often see private instance members prefixed with a "m_" or "_" (eg. _myVar or m_myVar) to avoid confusion..

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