public static VfpExpressionBinding BindAs(this VfpExpression input, VfpVariableReferenceExpression variable)
 {
     return(new VfpExpressionBinding(input, variable));
 }
 internal VfpGroupExpressionBinding(VfpExpression expression, VfpVariableReferenceExpression variable, VfpVariableReferenceExpression groupVariable)
 {
     Expression    = ArgumentUtility.CheckNotNull("expression", expression);
     Variable      = ArgumentUtility.CheckNotNull("variable", variable);
     GroupVariable = ArgumentUtility.CheckNotNull("groupVariable", groupVariable);
 }