Why is this code giving a compile error?

Why is this code giving a compile error?

• Barry Bond

  Coming from C++, this rule really irritates me. What is especially annoying is that it doesn't even let you declare a variable in an outer scope AFTER one of the same name has been declared in an inner scope, even though that could not possibly conflict. Consider:
  
  

  if ( something ) {     int i = 10; //A     Console.WriteLine( i ); } int i = 10;  //B

  
  
  The compiler error given for the line marked B says:
  

  A local variable named 'i' cannot be declared in this scope because it would give a different meaning to 'i', which is already used in a 'child' scope to denote something else

  
  Well, duh! No it won't! A variable is in scope from its point of declaration, so the 'i' introduced at B will NOT give a different meaning to the one introduced at A.
  
  Grrrr!
  
  

• johndog

  In c# it is not allowed to declare a variable wih same name in a function ,ie a variable is not allowed to shadow another variable with same name.Which on other hand is allowed in c++.Also if u declare one variable as of Field level  and another with function level having same name this would work.
  
  

• Meryl Junik

  ironically, not possible.
  
  

• Olivier Georg

   "i" is declared in the outer block and cannot be redeclared in the inner block. In this case C# behave like if "i" is a method: The method scope is the block in with you declarate it, do you can call to a method "b" from the method "a" declarated before.
  
  You can found the theory in http://msdn.microsoft.com/library/default.asp url=/library/en-us/csspec/html/vclrfcsharpspec_3_3.asp
  
  

• Luis Forero

  Hi,
  
  you declared a variable twice. If you made the first in a if or for statement it should work.
  
  

• James Liddell

  Compiler Error CS0136 http://whidbey.msdn.microsoft.com/library/default.asp url=/library/en-us/dndotnet/html/methodscope.asp
  
  

• Tanvir

  Ironically however, i belief (from memory) that this -is- possible:
  
  

  class="txt4" id="_ctl0_MainContent__ctl0_PostForm_ReplyBody"> int i = 20;  //B if ( something ) {     int i = 10; //A     Console.WriteLine( i ); // 10 } Console.WriteLine( i ); // 20

  
  
  
• Why is this code giving a compile error?