Post-validation is validation rules applied after parsing. It allows validating the value entered by the user.

In DateEdit, post-validation is controlled through the PostValidation property. The control provides various options for post-validation , as follows:

• Predefined values: Allows you to check whether input values match values in predefined values list or not. To specify predefined values, set the Values property.
• Excluded values: Allows you to specify values not permitted as input values. To set these values, set the ValuesExcluded property.
• Intervals: Allows you to check if input values belong to a specific interval. DateEdit supports even multiple intervals that you can specify by using the Intervals property.
• Validation method: Allows you to specify the method of validation. Set the Validation property to ValuesAndIntervals or PostValidatingEvent for declarative and programmatic validation, respectively.

The following code snippet shows how to set various properties to apply post-validation in DateEdit.

' apply PostValidation in DateEdit
C1DateEdit1.PostValidation.Validation = C1.Win.C1Input.PostValidationTypeEnum.ValuesAndIntervals
C1DateEdit1.PostValidation.Values = New ValueType() {1, 2, 4}
'New () {1, 2, 4}
C1DateEdit1.PostValidation.ErrorMessage = "Wrong"
C1DateEdit1.PostValidation.CaseSensitive = False

// apply PostValidation in DateEdit
c1DateEdit1.PostValidation.Validation = C1.Win.C1Input.PostValidationTypeEnum.ValuesAndIntervals;
c1DateEdit1.PostValidation.Values = new[] { 1, 2, 4 };
c1DateEdit1.PostValidation.ErrorMessage = "Wrong";
c1DateEdit1.PostValidation.CaseSensitive = false;