Articles → .NET → Invoke Different Validation Controls From A Single Button Using Validationgroup Property In Asp.Net

Invoke Different Validation Controls From A Single Button Using Validationgroup Property In Asp.Net

In this tutorial I will explain about how to conditionally invoke different validation controls from a single button using ValidationGroup property in asp.net. This topic contains following sections

Software requirement
Prerequisite knowledge
What is the purpose of ValidationGroup property in asp.net?
Create a new project
Add controls on the page
Write a code to set the validationGroup of the button.
Output

Software Requirement

Before you start reading this tutorial you should make sure that visual studio (2005 or above) is installed on your machine.

Prerequisite Knowledge

Before you go ahead, it is required that you should know

Basics about asp.net programming.
How to create a project using visual studio?
What are different server controls in asp.net?
Basics about control’s events.
What are validation controls in asp.net?

What Is The Purpose Of Validationgroup Property In Asp.Net?

The purpose of ValidationGroup is to categorize validation controls.

Create A New Project

Create a new website. See the screen shot below for project structure

Click to Enlarge

Add Controls On The Page

Add controls on the page. See the screen shot below for the controls and their purpose

Click to Enlarge

Write A Code To Set The Validationgroup Of The Button

Write the following code in aspx file

Name1:
<asp:TextBox ID="txtName1" runat="server"></asp:TextBox><asp:Button ID="btnTest" runat="server" Text="Button" /><br />
   Name2:
<asp:TextBox ID="txtName2" runat="server"></asp:TextBox><br /><asp:RequiredFieldValidator ID="rfvName1" runat="server" ValidationGroup="name1" ControlToValidate="txtName1" ErrorMessage="Please enter name1"></asp:RequiredFieldValidator><asp:RequiredFieldValidator ID="rfvName2" runat="server" ValidationGroup="name2" ControlToValidate="txtName2" ErrorMessage="Please enter name2"></asp:RequiredFieldValidator><br /><br /><br />
   Change Validation Group: 
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br /><asp:Button ID="btnChangeValidationGroup" runat="server" onclick="btnChangeValidationGroup_Click" Text="Change Validation Group" />

Write following code in code behind

protected void Page_Load(object sender, EventArgs e) {
	if (!IsPostBack) btnTest.ValidationGroup = "name1";
}

protected void btnChangeValidationGroup_Click(object sender, EventArgs e) {
	if (!string.IsNullOrEmpty(TextBox1.Text)) 
    btnTest.ValidationGroup = TextBox1.Text;
}

In the code behind file we are doing following steps

On page load we are assigning the ValidationGroup of button equal to the validation group of txtName1.
On click of button (with caption ‘Change Validation Group’) we are changing the validation group of button depends upon what value is entered in the textbox.

Output

On page load when user clicks the button

Click to Enlarge

Now change the validation group to name2 (which is the validation group for txtName2 textbox’s validator) and then click on button ‘Change Validation Group’. Once the button is clicked the validation group is changed for the button (caption ‘Button’). Now on click of button1(with caption ‘Button’) and you can see now button is validating other textbox.

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, February 8, 2013

Query/Feedback

Your Email Id		**

Subject		*

Query/Feedback	Characters remaining 250	**