RequiredFieldValidator control - Vinn

I am creating webpart for Sharepoint 2007.

I have written following code
on CreateChildControls() method
fieldVal = new RequiredFieldValidator();
fieldVal.ID = txtemail.ID + "_Val";
fieldVal.ControlToValidate = txtemail.ID;
fieldVal.EnableClientScript = true;

fieldVal.ErrorMessage = " Test";
fieldVal.InitialValue = "Zero";
fieldVal.Display =
System.Web.UI.WebControls.ValidatorDisplay.Dynamic;
//fieldVal.SetFocusOnError = txtemail;
Controls.Add(fieldVal);
also i have render control in renderwebpart  method.
when i m submitting page validation control doesn't not validate page.
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Vinni |