ASP.NET : How to Validate ListBox control
- Create a Web Form name “ListBoxValidation.aspx”.
- We can use RequiredFieldValidator Control for ListBox Control's Validation check.
- Here I showing you that a user must be select one Item when he submits the page.
- If he not selects any item then the [RequiredFieldValidator] Control shows an error message. The source code of “ListBoxValidation.aspx” is below.
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void Button1_Click(object sender, System.EventArgs e) { Label1.Text = "You selected : " + ListBox1.SelectedItem.Text.ToString(); } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>ListBox Example: How to Validate ListBox Control</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="Crimson" /> <br /><br /> <asp:Label ID="Label2" runat="server" Text="What you want to see?" /> <br /> <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Single"> <asp:ListItem>RadioButton Example</asp:ListItem> <asp:ListItem>RadioButtonList Example</asp:ListItem> <asp:ListItem>CheckBox Example</asp:ListItem> <asp:ListItem>CheckBoxList Example</asp:ListItem> <asp:ListItem>PlaceHolder Example</asp:ListItem> <asp:ListItem>AdRotator Example</asp:ListItem> <asp:ListItem>Xml Example</asp:ListItem> <asp:ListItem>DropDownList Example</asp:ListItem> </asp:ListBox> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ListBox1" ErrorMessage="Please select an Item"> </asp:RequiredFieldValidator> <br /><br /> <asp:Button ID="Button1" runat="server" Text="Check ListBox Validation" OnClick="Button1_Click" /> </div> </form> </body> </html>
So when you press CTRL + F5 you can see selected listbox with validation
If you have query , comment it
If you have query , comment it
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