Compiler Error CS0210

You must provide an initializer in a fixed or using statement declaration

You must declare and initialize the variable in a fixed statement. For more information, see Unsafe Code and Pointers (C# Programming Guide).

The following sample generates CS0210:

// CS0210a.cs
// compile with: /unsafe

class Point
{
   public int x, y;
}

public class MyClass
{
   unsafe public static void Main()
   {
      Point pt = new Point();

      fixed (int i)    // CS0210
      {
      }
      // try the following lines instead
      /*
      fixed (int* p = &pt.x)
      {
      }
      fixed (int* q = &pt.y)
      {
      }
      */
   }
}

The following sample also generates CS0210 because the using statement has no initializer.

// CS0210b.cs

using System.IO;
class Test 
{
   static void Main() 
   {
      using (StreamWriter w) // CS0210
      // Try this line instead:
      // using (StreamWriter w = new StreamWriter("TestFile.txt")) 
      {
         w.WriteLine("Hello there");
      }
   }
}