c# - In ASP.NET 3.5, what is the .Tag Namespace? -

i using textbox1.tag + textbox1.text calculator tag part not accepted. namespace must use accepted in asp.net 3.5 application?

you might thinking windows forms rather asp.net

the tag property property on system.windows.forms.control isn't web control. have @ system.web.ui.webcontrols.textbox information on available properties.