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Compiler Error CS0234

The type or namespace name 'name' does not exist in the class or namespace 'scope' (are you missing an assembly reference?)

A type was expected. Possible reasons include:

  • An assembly that contains the definition of a type was not referenced in the compilation; use /reference (Import Metadata) to specify the assembly.
  • You passed a variable name to the typeof operator.

See Add Reference Dialog Box for information on how to add a reference in the development environment.

The following sample generates CS0234:

// CS0234.cs
public class C
   public static void Main()
      System.DateTime x = new System.DateTim();   // CS0234
      // try the following line instead
      // System.DateTime x = new System.DateTime();
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