RequiredFieldValidator in CustomControl

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C#

ASP.NET

Hello,

I am preparing a control by extending TextBox. Here i included RequiredFieldValidator and range validators. But these are not working. Can you help me?Below is the code for CustomControl.

public class PasswordTextBox : TextBox
    {
        RequiredFieldValidator rfv = new RequiredFieldValidator();
        RangeValidator rv = new RangeValidator();

        private string minlength;
       public string Minlength
       {
           get { return minlength; }
           set { minlength = value; }
       }
       private string maxlength;
       public string Maxlength
       {
           get { return maxlength; }
           set { maxlength = value; }
       }

       protected override void OnInit(EventArgs e)
       {
           this.TextMode = TextBoxMode.Password;
           rfv.ErrorMessage = "*";
           rfv.ControlToValidate = this.ClientID;
           rv.ErrorMessage = "Password is not in range";
           rv.ControlToValidate = this.ClientID;
           rv.MinimumValue = minlength.ToString();
           rv.MaximumValue = maxlength.ToString();
       }
       protected override void RenderContents(HtmlTextWriter output)
       {
           this.RenderControl(output);
           rfv.RenderControl(output);
           rv.RenderControl(output);
       }
}