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ASP.Net CompareValidator Control

CompareValidator: The CompareValidator control compares a value in one control with a fixed value, or, a value in another control.

·         This control used to compare the value of one input control to the value of another input control, constants and data type using a comparison operator (equals, greater than, less than, and so on).
·         If the input control is empty, the validation will succeed. Use the RequiredFieldValidator control to make the field required.

CompareValidator additional properties (Check here for other default properties and sample):

Property
Description
ControlToCompare
The name of the control to compare with
Operator
The type of comparison to perform. The operators are:
  • Equal
  • GreaterThan
  • GreaterThanEqual
  • LessThan
  • LessThanEqual
  • NotEqual
  • DataTypeCheck
Type
Specifies the data type of the values to compare. The types are:
  • Currency
  • Date
  • Double
  • Integer
  • String
ValueToCompare
A specified value to compare with
  
  Control usage:

<asp:TextBox runat="server" ID="txtNumber1"></asp:TextBox>
<asp:TextBox runat="server" ID="txtNumber2"></asp:TextBox>

<asp:CompareValidator ID="cmpNumber" runat="server"
    ControlToValidate="txtNumber1" ControlToCompare="txtNumber2"
    Type="Integer" ErrorMessage="Number not matched">
</asp:CompareValidator>
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