TIP: Masked Textbox


When working with Web forms, you have to put in validation. Some validations are very common—such as Integer only, string only, web address, email address, SSN number, Date, and so forth. For pages that contain such type of validation, you have to do the repeated task of adding a textbox and then the Required field validator and regular expression validator. If you develop a smart control all validation is done by itself. You can save lot of development time. This inspired me to develop this custom control.


This control is useful for creating forms that require user data and check that the user has entered valid data. The types of data can be:

  • Integer only
  • String only
  • Email address
  • Date
  • Web Address
  • SSN number
  • US zip code


The basic idea is to put together TextBox, RequiredField validator, and RegularExpressionValidator and hide the complexity from the developer. The developer needs to assign certain properties; the control does all the validation on its own.

Using the Code

Just add the MaskedTextBox.dll in the VS.NET tool bar or add a reference to MaskedTextBox.dll. Assign these properties:

  • DataType (you can select Integer, string,email, web address, date, SSN number, and US zipcode)
  • Display (mode of message display; for example, Dynamic, static, or none)
  • ErrorMessage (message when validation fails)
  • RequiredErrorMessage (message when textbox is empty)
using System;
using System.Text;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.Web.UI.WebControls;

[assembly: TagPrefix ("MaskedTextBox", "Saifi") ]
namespace controlLib
   /// Created By saifi Hasan
   public enum DataTypeEnum { IntegerOnly  =0,
                              StringOnly   =1,
                              EmailAddress =2,
                              WebAddress   =3,
                              SSNNumber    =4,
                              USZipCode    =5,
                              DateMMDDYYY  =6,
                              DateYYYMMDD  =7
                            } ;
   [ToolboxBitmap(typeof(System.Web.UI.WebControls.TextBox)) ,
    ToolboxData("<{0}:MaskedTextBox runat=\"server\"
                Required=\"true\" DataType=\"IntegerOnly\" >
    Designer( "System.Web.UI.Design.WebControls" ,

   public class MaskedTextBox :
      System.Web.UI.WebControls.WebControl ,INamingContainer

      #region Private Members
         private RegularExpressionValidator  _emailFormatValidator;
         private RequiredFieldValidator      _emailRequiredValidator;
         private TextBox _emailTextBox;
         private DataTypeEnum _DataType ;
         private string _ErrorMessageCssClass;
         private string _ErrorMessage=  string.Empty;
         private string _RequiredErrorMessage = string.Empty;
         private bool   _Required =false;
         private ValidatorDisplay _Display  = ValidatorDisplay.Dynamic;

         string[] arrRegEx = {
            "^([-]|[0-9])[0-9]*$",    //integer Only
            "[^a-zA-Z]",              //string Only
            //Email address
            //Internet Email Only
            @"http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?",
            @"\d{3}-\d{2}-\d{4}",    //SSN No
            @"\d{5}(-\d{4})?",    //US Zip Code
            @"(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])
               [- /.](19|20)\d\d",    //Date in MM-DD-YYY format
            @"(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12]
               [0-9]|3[01])"          //Date in YYY-MM-DD format


      #region Properties
          Description ("Text box DataType") ]
         public DataTypeEnum DataType
            get { return _DataType ;}
            set { _DataType = value;}

          Description ("Display Mode") ]
         public ValidatorDisplay Display
            get { return _Display ;}
            set { _Display = value;}

          Description ("Text box DataType") ]
         public bool Required
            get { return _Required ;}
            set { _Required = value;}

          Description ("Error Message format") ]
         public string ErrorMessage
            get { return _ErrorMessage ;}
            set { _ErrorMessage value  ;}

          Description ("Error Message for Required Validation") ]
         public string RequiredErrorMessage
            get { return _RequiredErrorMessage  ;}


      #region Constructor
      public MaskedTextBox()


      protected override void OnInit(EventArgs e)

         base.OnInit (e);

      protected override void CreateChildControls()


         _emailTextBox = new TextBox();
         _emailTextBox.ID = "emailTextBox";

         _emailRequiredValidator = new RequiredFieldValidator();
         _emailRequiredValidator.ID = "emailRequiredValidator";
         _emailRequiredValidator.ControlToValidate =

         _emailRequiredValidator.ErrorMessage = _RequiredErrorMessage;
         _emailRequiredValidator.Display = _Display;

         _emailFormatValidator = new RegularExpressionValidator();
         _emailFormatValidator.ID = "emailFormatValidator";
         _emailFormatValidator.ControlToValidate = _emailTextBox.ID;
         int iValidExp = _DataType.GetHashCode();

         _emailFormatValidator.ValidationExpression =

         _emailFormatValidator.ErrorMessage = _ErrorMessage;
         _emailFormatValidator.Display = _Display;


         /*end validator*/


      #region Render Method
      protected override void Render(System.Web.UI.HtmlTextWriter writer)

         base.Render (writer);


About the Author

saifi hasan

I have been in development Web Application, Web Sevices for last 3 yrs.Currently working with TCS India



  • See it!

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