variable chapter c# switch statement


why c# switch statement, non-static used churned cases, wholly announce initial case?



for example, following throws blunder "a internal non-static named 'variable' already tangible scope".



switch (type)
{
    box type.a:
            twine non-static = "x";
                break;
    box type.b:
            twine non-static = "y";
                break;
}


however, per logic, initial chapter should strike form type.b. variables within switch matter exist unparalleled scope, created/allocated before any explanation processed?



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