How to validate multiple CheckBox control in ASP.NET

Question

How to validate multiple CheckBox control in ASP.NET?

Sahil Jani · Answer

Hi, Most probably you wil find your answer on the following link ::: http://weblogs.asp.net/samirgeorge/archive/2009/05/02/checkboxlist-client-side-validation-using-jquery.aspx

Ankit Nandekar · Answer

try this it is working for me using System; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; public partial class _Default : System.Web.UI.Page { int c = 0; protected void Page_Load(object sender, EventArgs e) { lblMsg.Visible = false; } protected void CheckBox1_CheckedChanged(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { foreach (Control chkcontrol in form1.Controls) { if (chkcontrol.GetType().ToString() == "System.Web.UI.WebControls.CheckBox") { if (((CheckBox)chkcontrol).Checked == true) { c++; // write code when check box checked } else { if (c == 0) { lblMsg.Visible = true; lblMsg.Text = "please select CheckBox"; } } } } } }

Abhimanyu K Vatsa · Answer

hey most probably we uses javascript for this but there are couple of ways, use this if you wish via javascript: type = "text/javascript" > $ ( 'table[id$=GridView1]' ). find ( 'input:checkbox' ). click ( function ( e ) { var tr = $ ( this ). closest ( 'tr' ); var lblError = tr . find ( 'span[id$=lblError]' ); if ( tr . find ( 'input:checkbox:checked' ). length == 3 ) { lblError . html ( 'Not possible to select more than 2.' ); this . checked = false ; } else { lblError . html ( '' ); } }); visit there for more: http://wikiaspnet.wordpress.com/2008/08/22/validate-checkbox/