Why to declare the datatype in foreach loop?

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Why do we need to mention datatype of a variable inside foreach loop ?

C#

foreach(string strName in strFilePath)
{
   //Operations here
}

Why cannot we declare it outside?

C#

string strName = ""; 
foreach (strName in strFilePath)
{
   //Operations here
}

Posted 26-Jun-12 19:30pm

thomforum

Updated 26-Jun-12 19:32pm

Prasad_Kulkarni

v2

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OriginalGriff · Accepted Answer · 2012-06-26T19:37:00

Because the variable used in a foreach loop is special - it has limited scope and is read only.

The declaration is a reminder (if you like) that it is a special value, and not to be treated like "normal" variables. It limits the scope of the variable to just the extent of the loop without complex machinations. Otherwise, it would imply that the read-only status could be changed (which it can't) or that any initial value from before the loop began could be referenced (which it can't).