How to make a TextBox accept only alphabetic characters

Question

How can I make a TextBox only accept alphabetic characters with spaces

User · Answer

Try following code in KeyPress event of textbox  if  char IsLetter e KeyChar     false   amp           Convert ToString e KeyChar     Microsoft VisualBasic Constants vbBack              e Handled   true

User · Answer

Write Code in Text KeyPress Event as   private void textBox1 KeyPress object sender  KeyPressEventArgs e                 if   char IsLetter e KeyChar                         e Handled   true

User · Answer

you can try following code that alert at the time of key press event  private void tbOwnerName KeyPress object sender  KeyPressEventArgs e                                      to accept only charactrs  amp  space backspace                                                       if  e Handled     char IsLetter e KeyChar     e KeyChar     char Keys Back    e KeyChar     char Keys Space                         e Handled   true              base OnKeyPress e               MessageBox Show  enter characters only

User · Answer

Try This              private void tbCustomerName KeyPress object sender  KeyPressEventArgs e                e Handled     char IsLetter e KeyChar     e KeyChar     char Keys Back  e KeyChar   char Keys Space           It Allows White Spaces Too

User · Answer

works for me  even though not the simplest one  private void Alpha Click object sender  EventArgs e                        int count   0              foreach  char letter in inputTXT Text                                if  Char IsLetter letter                                         count                                      else                                       count   0                                              if  count    inputTXT Text Length                                errorBox Text    quot The input text must contain only alphabetic characters quot                             else                               errorBox Text    quot  quot

User · Answer

private void textBox2 KeyPress object sender  KeyPressEventArgs e                        if  e KeyChar  gt    0   amp  amp  e KeyChar  lt    9                   e Handled   true              else                 e Handled   false

User · Answer

The simplest way is to handle the TextChangedEvent and check what s been typed   string oldText   string Empty      private void textBox2 TextChanged object sender  EventArgs e                if  textBox2 Text All chr   gt  char IsLetter chr                          oldText   textBox2 Text              textBox2 Text   oldText               textBox2 BackColor   System Drawing Color White              textBox2 ForeColor   System Drawing Color Black                    else                       textBox2 Text   oldText              textBox2 BackColor   System Drawing Color Red              textBox2 ForeColor   System Drawing Color White                    textBox2 SelectionStart   textBox2 Text Length          This is a regex-free version if you prefer  It will make the text box blink on bad input  Please note that it also seems to support paste operations as well

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private void textBox1 KeyPress object sender  KeyPressEventArgs e              if   char IsControl e KeyChar   amp  amp   char IsLetter e KeyChar   amp  amp            e KeyChar                              e Handled   true            MessageBox Show  Only Alphabets

User · Answer

This solution uses regular expressions  does not allow invalid characters to be pasted into the text box and maintains the cursor position   using System Text RegularExpressions   int CursorWas  string WhatItWas   private void textBox1 Enter object sender  EventArgs e                WhatItWas   textBox1 Text         private void textBox1 TextChanged object sender  EventArgs e                if  Regex IsMatch textBox1 Text     a-zA-Z                              WhatItWas   textBox1 Text                    else                       CursorWas   textBox1 SelectionStart    0   0   textBox1 SelectionStart - 1              textBox1 Text   WhatItWas              textBox1 SelectionStart   CursorWas                    Note  textBox1 TextChanged recursive call

User · Answer

You can try by handling the KeyPress event for the textbox  void textBox1 KeyPress object sender  KeyPressEventArgs e        e Handled     char IsLetter e KeyChar     e KeyChar     char Keys Back       Additionally say allow backspace in case you want to remove some text  this should work perfectly fine for you  EDIT  The above code won t work for paste in the field for which i believe you will have to use TextChanged event but then it would be a bit more complicated with you having to remove the incorrect char or highlight it and place the cursor for the user to make the correction Or maybe you could validate once the user has entered the complete text and tabs off the control

User · Answer

You could use the following snippet   private void textBox1 TextChanged object sender  EventArgs e        if   System Text RegularExpressions Regex IsMatch textBox1 Text     a-zA-Z                    MessageBox Show  This textbox accepts only alphabetical characters            textBox1 Text Remove textBox1 Text Length - 1

User · Answer

This one is working absolutely fine      private void manufacturerOrSupplierTextBox KeyPress object sender  KeyPressEventArgs e                if  char IsControl e KeyChar     char IsLetter e KeyChar                         return                    e Handled   true

User · Answer

if  System Text RegularExpressions Regex IsMatch textBox1 Text     a-zA-Z                                    else                       textBox1 Text   textBox1 Text Remove textBox1 Text Length - 1               MessageBox Show  Enter only Alphabets                  Please Try this

User · Answer

private void textbox1 KeyDown 1 object sender  KeyEventArgs e        if  e Key  gt   Key A  amp  amp  e Key  lt   Key Z                  else              e Handled   true

User · Answer

This works fine as far as characters restriction  Any suggestions on error msg prompt with my code if it s not C OR L Private Sub TXTBOX TextChanged sender As System Object  e As System EventArgs  Handles TXTBOX TextChanged          Dim allowed As String    quot C L quot          For Each C As Char In TXTBOX Text             If allowed Contains C    False Then                  TXTBOX Text   TXTBOX Text Remove TXTBOX SelectionStart - 1  1                  TXTBOX Select TXTBOX Text Count  0               End If          Next            End Sub

User · Answer

Here is my solution and it works as planned   string errmsg    ERROR   Wrong input   ErrorLbl Text   errmsg   if  e Handled     char IsLetter e KeyChar     e KeyChar     char Keys Back    e KeyChar     char Keys Space       ErrorLbl Text    ERROR   Wrong input     else ErrorLbl Text   string Empty  if  ErrorLbl Text    errmsg      Nametxt Text   string Empty

[c#] How to make a TextBox accept only alphabetic characters?

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