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A special comparison operation can be made to verify that the associated input control's value is of a specified data type.You can make comparisons against different data types such as String, Date, and Integer.The control allows you to build a validation control for a custom specification.
This work great when the user enter wrong informations into the control and leaves the control.
The control also trims whitespace in order to check for the required field entry.
The property can be set to the same initial value as the drop-down list, Select a State.
This kind of situation is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their Validation Group property.