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How to use CompareValidator validation control with example in asp.net

Introduction: While creating user input form e.g. registration where user inputs the details like Name, email address, password and confirm password etc. we have to implement validations on the form so that incorrect data could not be submitted to server. Asp.net provides Validation controls like CompareValidator, CustomValidator, RangeValidator, RegularExpressionValidator, RequiredFieldValidator etc to apply validations on asp.net web page. 
In previous articles i explained How to use RequiredFieldValidator validation control with example in asp.net and RegularExpressionValidator and RangeValidator and CustomValidator and JavaScript validation in asp.net website and Jquery form validations in asp.net.

 Now in this article I will explain with example How to use CompareValidator control to compare the data in two TextBoxes e.g. Password TextBox and Confirm password TextBox should be same before submitting to server for processing otherwise error message will be displayed to the user.

 In this example I have demonstrated 3 different ways to use CompareValidator control. 

CompareValidator validation control example in asp.net
Case 1:  If you want to show the validation failure message near to text box for which the validation failed as shown in figure below:

CompareValidator validation control example in asp.net

then In the design page(.aspx) Place two TextBox controls for entering Password and Confirm Password and a Button control for Submitting . Also place a CompareValidator validation controls from validation category from the visual studio toolbox as shown in figure below:

CompareValidator  validation control example in asp.net


<fieldset style="width:450px;">
            <legend>CompareValidator example in asp.net</legend>
            <table>
                <tr>
                    <td>Password: <span style="color:red;">*</span></td>
                    <td>
                        <asp:TextBox ID="txtPwd" runat="server" TextMode="Password"></asp:TextBox>
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
                <tr>
                    <td>Confirm Password: <span style="color:red;">*</span></td>
                    <td>
                        <asp:TextBox ID="txtConfirmPwd" runat="server" TextMode="Password"></asp:TextBox>
                    </td>
                     <td><asp:CompareValidator ID="cmpPwd" runat="server" ControlToCompare="txtConfirmPwd" ControlToValidate="txtPwd" ErrorMessage="Password didn't match" ForeColor="#FF3300" SetFocusOnError="True" ></asp:CompareValidator></td>
                </tr>
                <tr>
                    <td>&nbsp;</td>
                    <td>
                        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
                    </td>
                </tr>
            </table>
        </fieldset>

Case 2: If you want the validation failure message to show in pop up as shown in figure below:

CompareValidator validation control example in asp.net

then change the Display property of the CompareValidator validation controls to None and place a ValidationSummary control from the same validation category from the visual studio toolbox. Set the ShowMessageBox property to true and ShowSummary to false as shown below  :
 

<fieldset style="width:450px;">
            <legend>CompareValidator example in asp.net</legend>
            <table>
                <tr>
                    <td>Password: <span style="color:red;">*</span></td>
                    <td>
                        <asp:TextBox ID="txtPwd" runat="server" TextMode="Password"></asp:TextBox>
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
                <tr>
                    <td>Confirm Password: <span style="color:red;">*</span></td>
                    <td>
                        <asp:TextBox ID="txtConfirmPwd" runat="server" TextMode="Password"></asp:TextBox>
                    </td>
                     <td><asp:CompareValidator ID="cmpPwd" runat="server" ControlToCompare="txtConfirmPwd" ControlToValidate="txtPwd" ErrorMessage="Password didn't match" ForeColor="#FF3300" SetFocusOnError="True" Display="None" ></asp:CompareValidator></td>
                </tr>
                <tr>
                    <td>&nbsp;</td>
                    <td>
                        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
                    </td>
                     <td>&nbsp;</td>
                </tr>
                <tr>
                    <td colspan="3">
                        <asp:ValidationSummary ID="ValidationSummary1" runat="server" ForeColor="#FF3300" HeaderText="Please correct the following:" ShowMessageBox="True" ShowSummary="False" />
                    </td>
                </tr>
            </table>

        </fieldset>

Case 3: If you want to show validation failure message in a separate place as shown in figure below :

CompareValidator validation control example in asp.net

 then Set the ShowMessageBox property to false and ShowSummary property to true as shown below.


<asp:ValidationSummary ID="ValidationSummary1" runat="server" ForeColor="#FF3300" HeaderText="Please correct the following:" ShowMessageBox="false" ShowSummary="true"/>


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