How Does Local-Scope Work in C# [duplicate]

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This question already has answers here:

Child Scope & CS0136 (2 answers)

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

Possible Duplicate:
Child Scope & CS0136
C# Variable Scoping

Though I have been using C# for quite some time, I have just stumbled upon this error.

If I have the following:

if(true)
{
    int x = 0;
}
int x = 0;

I get an error that says: A local variable named 'x' cannot be declared in this scope because it would give a different meaning to 'x', which is already used in a child scope to denote something else.

And if I do this:

if(true)
{
    int x = 0;
} 
x = 0;

I get an error that says: The name 'x' does not exist in the current context.

I can understand having one or the other, but why do both of these errors exist? Is there a way around the first option? I find it very annoying.

Thanks.