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             ExceptionHelpers.cs
        
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      using System;

      using System.Reflection;

      using System.Runtime.ExceptionServices;

      namespace Implab {

          static class ExceptionHelpers {

              public static Exception Rethrow(this Exception that) {

                  ExceptionDispatchInfo.Capture(that).Throw();

                  return new TargetInvocationException(that);

              }

              public static Exception Wrap(this Exception that) {

                  if (that == null)

                      return new Exception();

                  else if (that is OperationCanceledException)

                      return new OperationCanceledException("The operation has been cancelled", that);

                  else

                      return new TargetInvocationException(that);

              }

          }

      }

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				using System;
				using System.Reflection;
				using System.Runtime.ExceptionServices;

				namespace Implab {
				static class ExceptionHelpers {
				public static Exception Rethrow(this Exception that) {
				ExceptionDispatchInfo.Capture(that).Throw();
				return new TargetInvocationException(that);
				}

				public static Exception Wrap(this Exception that) {
				if (that == null)
				return new Exception();
				else if (that is OperationCanceledException)
				return new OperationCanceledException("The operation has been cancelled", that);
				else
				return new TargetInvocationException(that);
				}
				}
				}