Complete ASPX HTML Code:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<style type="text/css">
.error
{
border: 1px solid red;
}
.errorstyle
{
font-size: 16px;
line-height: 22px;
}
.errorstyle ul li
{
margin-left: 5px;
color: #ff0000;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div style="width:300px;">
<fieldset>
<legend>Validate TextBox</legend>
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
</fieldset>
<fieldset>
<legend>Validate DropDownList</legend>
<asp:DropDownList ID="DropDownList1" runat="server" Width="150px">
<asp:ListItem Value="0" Text="--Select--"></asp:ListItem>
<asp:ListItem Value="1" Text="Asp.Net"></asp:ListItem>
<asp:ListItem Value="2" Text="MVC"></asp:ListItem>
<asp:ListItem Value="3" Text="C#"></asp:ListItem>
<asp:ListItem Value="4" Text="jQuery"></asp:ListItem>
</asp:DropDownList>
</fieldset>
<fieldset>
<legend>Validate CheckBox</legend>
<asp:CheckBox ID="CheckBox1" runat="server" Text="Married" />
</fieldset>
<fieldset>
<legend>Validate CheckBoxList</legend>
<asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatColumns="2">
<asp:ListItem Value="1" Text="Asp.Net"></asp:ListItem>
<asp:ListItem Value="2" Text="MVC"></asp:ListItem>
<asp:ListItem Value="3" Text="C#"></asp:ListItem>
<asp:ListItem Value="4" Text="jQuery"></asp:ListItem>
</asp:CheckBoxList>
</fieldset>
<fieldset>
<legend>Validate RadioButton</legend>
<asp:RadioButton ID="RadioButton1" runat="server" Text="Married" />
</fieldset>
<fieldset>
<legend>Validate RadioButtonList</legend>
<asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatColumns="2">
<asp:ListItem Value="1" Text="Asp.Net"></asp:ListItem>
<asp:ListItem Value="2" Text="MVC"></asp:ListItem>
<asp:ListItem Value="3" Text="C#"></asp:ListItem>
<asp:ListItem Value="4" Text="jQuery"></asp:ListItem>
</asp:RadioButtonList>
</fieldset>
<fieldset>
<legend>Validate ListBox</legend>
<asp:ListBox ID="ListBox1" runat="server" Width="150px">
<asp:ListItem Value="1" Text="Asp.Net"></asp:ListItem>
<asp:ListItem Value="2" Text="MVC"></asp:ListItem>
<asp:ListItem Value="3" Text="C#"></asp:ListItem>
<asp:ListItem Value="4" Text="jQuery"></asp:ListItem>
</asp:ListBox>
</fieldset>
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
<div class="errorstyle" >
<asp:Literal ID="ltrlErrorMsg" runat="server"></asp:Literal>
</div>
</div>
</form>
</body>
Complete Code Behind:-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Text;
using System.Web.UI.WebControls;
public partial class Default4 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (IsControlsValid())
{
// Form is validated. Write your submit button code here.
}
}
private bool IsControlsValid()
{
bool isValid = true;
StringBuilder sb = new StringBuilder();
sb.Append("<ul>");
//Validate TextBox(can't be left empty)
if (String.IsNullOrEmpty(txtName.Text.Trim()))
{
isValid = false;
txtName.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please enter in TextBox"));
}
else
{
txtName.CssClass = "";
}
//Validate DropDownList(Item must be selected)
if (DropDownList1.SelectedValue == "0")
{
isValid = false;
DropDownList1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select DropDowlist item"));
}
else
{
DropDownList1.CssClass = "";
}
//Validate CheckBox(Must be checked)
if (!CheckBox1.Checked)
{
isValid = false;
CheckBox1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select Checkbox"));
}
else
{
CheckBox1.CssClass = "";
}
//Validate RadioButton(Must be selected)
if (!RadioButton1.Checked)
{
isValid = false;
RadioButton1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select RadioButton"));
}
else
{
RadioButton1.CssClass = "";
}
//Validate CheckBoxList(At least one item must be selected)
foreach (ListItem item in CheckBoxList1.Items)
{
if (item.Selected)
{
isValid = true;
break;
}
else
{
isValid = false;
}
}
if (isValid == false)
{
CheckBoxList1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select at least one option from CheckBoxList"));
}
else
{
CheckBoxList1.CssClass = "";
}
//Validate RadioButton(Item must be selected)
foreach (ListItem item in RadioButtonList1.Items)
{
if (item.Selected)
{
isValid = true;
break;
}
else
{
isValid = false;
}
}
if (isValid == false)
{
RadioButtonList1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select at least one option from RadioButtonList"));
}
else
{
RadioButtonList1.CssClass = "";
}
//Validate ListBox (Item must be selected)
foreach (ListItem item in ListBox1.Items)
{
if (item.Selected)
{
isValid = true;
break;
}
else
{
isValid = false;
}
}
if (isValid == false)
{
ListBox1.CssClass = "error";
sb.Append(String.Format("<li>{0}</li>", "Please select at least one item from ListBox"));
}
else
{
ListBox1.CssClass = "";
}
sb.Append("</ul>");
ltrlErrorMsg.Text = sb.ToString();
return isValid;
}
}
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