function doStartDateCheck(source, args) { var arg = document.getElementById('<%=calStart.FindControl("txtCalender").ClientID %>').value; if (arg == "") { args.IsValid = false; } else { args.IsValid = true; } }
Microsoft JScript runtime error: Sys.ArgumentUndefinedException: Value cannot be undefined. Parameter name: id
calStart.FindControl("txtCalender").ClientID
var
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