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asp:CompareValidator control</td>
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CompareValidator control is used to compare two values. The value to compare can be either a value of another control or a constant specified.
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CompareValidator control is used to comapre two values. The value to compare can be either a value of another control or a constant specified.
There are predefined data types that can be compared like string, integer etc.
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Following are main properties of the validation control.
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<td class="DemoCP">ControlToCompare</td>
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Gets or sets the ID of the control whose value will be compared with the currently entered value.
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<td class="DemoCP">Operator</td>
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DataTypeCheck/Equal/GreaterThan/GreaterThanEqual/LessThan/LessThanEqual/NotEqual.
Used to specify the comparison operation to peform. In case of DataTypeCheck, <span class="DemoCP">ControlToCompare</span> properties are ingnored.
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<td class="DemoCP">Display</td>
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Dynamic/Static. Used to indicate how the area of error message will be allocated. <br />
Dynamic: Error message area will only be allocated when error will be displayed. Static: Error messagea area will be allocated in either case.
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<td class="DemoCP">Enabled</td>
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true/false. Gets or sets whether to enable the validation control or not.
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<td class="DemoCP">ErrorMessage</td>
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Gets or sets the text of the error message that will be displayed when validation fails (This is displayed when ValidationSummary validatoin control is used.).
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<td class="DemoCP">Text</td>
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Gets or sets the description of the error message text.
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<td class="DemoCP">ValidationGroup</td>
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Gets or sets the validation group it belongs to. This is used to group a set of controls.
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<td class="DemoCP">SetFocusOnError</td>
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true/false. Used to move focus on to the control that fails the validation.
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DEMO : CompareValidator
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<a class="DemoShowSource" href="../../misc/codeviewer/default.aspx?pagename=~/tutorials/controls/comparevalidator.aspx" target="_blank">Show Source Code</a>
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<asp:Label ID="lbl" AssociatedControlID="TextBox1" runat="Server" Text="Write into TextBox"></asp:Label>
<asp:TextBox ID="TextBox1" runat="Server"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="Server"></asp:TextBox>
<asp:RequiredFieldValidator ID="req1" runat="Server" ControlToValidate="TextBox1" ErrorMessage="1st TextBox is Mandatory field" Text="<br>Please write something in 1st Box."></asp:RequiredFieldValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="Server" ControlToValidate="TextBox2" ErrorMessage="2nd TextBox is Mandatory field" Text="<br>Please write something in 2nd Box."></asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="Server" ControlToValidate="TextBox2" ControlToCompare="TextBox1" Operator="Equal" Type="string" Text="Both textbox value should be same." ErrorMessage="Both textbox values are not equal." Display="Static"></asp:CompareValidator>
<asp:Button ID="btnSubmit" runat="Server" OnClick="WriteTextBoxValue" Text="Submit" />
<asp:ValidationSummary ID="ValidationSummary" runat="Server" ShowMessageBox="true" />
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<asp:Label ID="lblMessage" runat="Server" ForeColor="red" EnableViewState="False"></asp:Label>
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<pre>
<asp:Label ID="lbl" AssociatedControlID="TextBox1" runat="Server" Text="Write into TextBox"></asp:Label>
<asp:TextBox ID="TextBox1" runat="Server"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="Server"></asp:TextBox>
<asp:RequiredFieldValidator ID="req1" runat="Server" ControlToValidate="TextBox1" ErrorMessage="1st TextBox is Mandatory field" Text="<br>Please write something in 1st Box."></asp:RequiredFieldValidator>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="Server" ControlToValidate="TextBox2" ErrorMessage="2nd TextBox is Mandatory field" Text="<br>Please write something in 2nd Box."></asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="Server" ControlToValidate="TextBox2" ControlToCompare="TextBox1" Operator="Equal" Type="string" Text="Both textbox value should be same." ErrorMessage="Both textbox values are not equal." Display="Dynamic"></asp:CompareValidator>
<asp:Button ID="btnSubmit" runat="Server" OnClick="WriteTextBoxValue" Text="Submit" />
<asp:ValidationSummary ID="ValidationSummary" runat="Server" ShowMessageBox="true" />
</pre>
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