Advanced Text Box

Source code of text box which enables
alphanumeric input
only letter
upper case (all characters are converted to upper case)

 

   1: using System;

   2: using System.Collections.Generic;

   3: using System.ComponentModel;

   4: using System.Data;

   5: using System.Drawing;

   6: using System.Linq;

   7: using System.Text;

   8: using System.Windows.Forms;

   9:  

  10: namespace Master

  11: {

  12:     public enum InptTyp

  13:     {

  14:         alphanum,

  15:         onlyUpper,

  16:         onlyUpperLetter,

  17:  

  18:     }

  19:     public partial class AdvTextBox : TextBox

  20:     {

  21:         private InptTyp inputType;

  22:         public InptTyp InputType

  23:         {

  24:             get

  25:             {

  26:                 return inputType;

  27:             }

  28:             set

  29:             {

  30:                 inputType = value;

  31:             }

  32:  

  33:         }

  34:         public AdvTextBox()

  35:         {

  36:             InitializeComponent();

  37:         }

  38:  

  39:         protected override void OnPaint(PaintEventArgs pe)

  40:         {

  41:             base.OnPaint(pe);

  42:         }

  43:         protected override void OnKeyPress(KeyPressEventArgs e)

  44:         {

  45:             int i = (int)e.KeyChar;

  46:             switch (inputType)

  47:             {

  48:                 case InptTyp.alphanum:

  49:                     if ((i < 43 || i > 60) && i != 8)//did not use char.isnumeric because this allows to add - and . like characters

  50:                         e.Handled = true;

  51:                     break;

  52:                 case InptTyp.onlyUpperLetter:

  53:                     if (!Char.IsLetter(e.KeyChar))

  54:                     {

  55:                         e.Handled = true;

  56:                         return;

  57:                     }

  58:                     goto case InptTyp.onlyUpper;

  59:                 case InptTyp.onlyUpper:

  60:                     e.KeyChar = Char.ToUpper(e.KeyChar);

  61:                     break;

  62:             }

  63:  

  64:             base.OnKeyPress(e);

  65:  

  66:         }

  67:  

  68:  

  69:     }

  70: }