The RangeValidator Control in .NET framework

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The RangeValidator Control
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The RangeValidator control exposes three properties: MinimumValue, MaximumValue, and Type. The third property determines the type of the value and affects how the values are
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24:
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compared. It can be String (the default), Integer, Double, Date, and Currency. (Notice that this control doesn t work with Long values.) This code uses a RangeValidator control to check whether a txtYearBorn field contains a value in the range 1901 to 2000 (inclusive):
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RangeValidator1.ControlToValidate = txtYearBorn"
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RangeValidator1.MinimumValue = 1901"
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RangeValidator1.MaximumValue = 2000"
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RangeValidator1.Type = ValidationDataType.Integer
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RangeValidator1.ErrorMessage = Year Born must be in the range [1901,2000]"
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The CompareValidator Control
The CompareValidator control can compare the contents of the associated input control with another value, either the constant value specified by the ValueToCompare property or the contents of another control specified by the ControlToCompare property. The Type property tells the type of both values and the Operator property is an enumerated value that specifies the comparison operator to be applied to the two values (can be Equal, NotEqual, GreaterThan, GreaterThanEqual, LessThan, LessThanEqual, or DataTypeCheck). The following code checks that the txtYearMarried control contains an integer value that s greater than the value of the txtYearBorn control:
CompareValidator1.ControlToValidate = txtYearMarried" CompareValidator1.ControlToCompare = txtYearBorn" CompareValidator1.Type = ValidationDataType.Integer CompareValidator1.Operator = ValidationCompareOperator.GreaterThan
You can assign DataTypeCheck to the Operator property if you just want to verify that the contents of the input field can be safely converted to the data type specified by the Type property. In this case, the ControlToCompare and ValueToCompare properties are ignored:
Check that txtLastVisit contains a valid date. CompareValidator2.ControlToValidate = txtLastVisit" CompareValidator2.Type = ValidationDataType.Date CompareValidator2.Operator = ValidationCompareOperator.DataTypeCheck CompareValidator2.ErrorMessage = Last visit isn t a valid date.
When comparing the contents of your control to a constant value, you must use the ValueToCompare property:
CompareValidator3.ControlToValidate = txtChildren"
CompareValidator3.ValueToCompare = 0"
CompareValidator3.Type = ValidationDataType.Integer
CompareValidator3.Operator = ValidationCompareOperator.GreaterThanEqual
CompareValidator3.ErrorMessage = Number of children must >= 0
The following are potential problems you might encounter when using the CompareValidator control:
No validation is performed if the input control is empty, so you should use a RequiredFieldValidator control to ensure that an empty field displays an error message.
Part VI:
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If the value in the input control can be converted to the data type specified by the Type property but the value in the control specified by the ControlToCompare property can t be converted, the input control passes the validation. For this rea son, you might need an additional RangeValidator or CompareValidator control to check that the other control contains a valid value. If the value specified in the ValueToCompare property can t be converted to the data type specified by the Type property, an exception is thrown. In general, you should never specify both the ControlToCompare and ValueToCompare properties. If you do, the ControlToCompare property has the priority.
The RegularExpressionValidator Control
If you re familiar with regular expressions which I covered in 11 using the RegularExpressionValidator control is a breeze. You just have to set the ControlToVali date and the ValidationExpression properties:
Ensure that a field contains a phone number in the (###)###-#### format. RegularExpressionValidator1.ControlToValidate = txtPhoneNumber" RegularExpressionValidator1.ValidationExpression = \(\d{3}\)\d{3}-\d{4}" RegularExpressionValidator1.ErrorMessage = _ Please enter the phone number in (###)###-#### format
In many cases, you don t even have to be a regular expression wizard to use this validation control effectively. In fact, Visual Studio .NET lets you pick the regular expressions for the most common field types, such as phone numbers, postal codes, URLs, e-mail addresses, and social security numbers. (See Figure 24-14.) Here are other useful regular expressions:
(rev1 is a RegularExpressionValidator control.) A one-character Yes/No/True/False field rev1.ValidationExpression = [YyNnTtFf]" 16-digit credit card number, with or without spaces rev1.ValidationExpression = (\d{4}( \d{4}){3}|\d{16})" A month/year expiration date in the format mm/yy rev1.ValidationExpression = (0[1-9]|1[0-2])/\d\d" An alphanumeric password of at least 8 characters rev1.ValidationExpression = [A-Za-z0-9]{8,}
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