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Posted 11 Oct 2013

CompareValidator

, 11 Oct 2013
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The CompareValidator control compares the value of one control to another, or to an explicit value in the control's ValueToCompare property.

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The CompareValidator control compares the value of one control to another, or to an explicit value in the control's ValueToCompare property. CompareValidator uses three key properties to perform its validation. ControlToValidate and ControlToCompare contain the values to compare. Operator defines the type of comparison to perform, for example, Equal, Not Equal, Greater than, Less than, DataType and others. CompareValidator performs the validation by evaluating these properties as an expression.

The ValueToCompare property can be set dynamically by Javascript if necessary, for example, you can use it with a DropDown list you want to make sure that selected value not equal to -1.

When the type of value being compared is not a string, you have to specify the Type property as one of the following:

  • String
  • Integer
  • Double
  • Date
  • Currency

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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The ASP.NET Wiki was started by Scott Hanselman in February of 2008. The idea is that folks spend a lot of time trolling the blogs, googlinglive-searching for answers to common "How To" questions. There's piles of fantastic community-created and MSFT-created content out there, but if it's not found by a search engine and the right combination of keywords, it's often lost.

The ASP.NET Wiki articles moved to CodeProject in October 2013 and will live on, loved, protected and updated by the community.
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