I am having text box, label and button in a repeater control. Button should validate the text box. If the user enter greater than number 4, error message should appear and the text box value should be change based on the label box value.
How to validate the textbox using custom validation inside repeater?
On OnItemDataBound event OR OnItemCreated event execute this code
Label lbl = (Label)e.Item.FindControl("lblId"); Button btn = (Button)e.Item.FindControl("btnId"); TextBox txt = (TextBox)e.Item.FindControl("txtId"); CustomValidator cfv = (CustomValidator)e.Item.FindControl("cfvId"); if (cfv != null && txt!=null&&btn!=null&&lblId!=null) { cfv.ControlToValidate = txt.ClientID; cfv.ClientValidationFunction = "YourFunction"; cfv.ValidationGroup = cfv.ClientID + "ValidationGroup"; btn.ValidationGroup = cfv.ClientID + "ValidationGroup"; lbl.AssociatedControlID=txt.ClientID; } //javascript code on client side function YourFunction(sender, args) { args.IsValid=parseInt(args.Value)<=4; if(!args.IsValid) $('#'+sender.controltovalidate).val($('label:[for="'+sender.controltovalidate+'"]').text()); return; } 
