How to restrict character from textbox?

How to restrict character from textbox?

• latesh

  Thanks;)

  
  

• Peter Gadsby

  You can use a masked textbox, or you can handle the key pressed event and write code like this:

  private void OnNumericKeyPress(object sender, KeyPressEventArgs e)

  {

  TextBox tb = sender as TextBox;

  e.Handled = !(Char.IsControl(e.KeyChar) ||

  Char.IsNumber(e.KeyChar) ||

  (e.KeyChar == '.' && !tb.Text.Contains(".")));

  }

  Sorry, that's C#, but all you need to do is use Char.IsControl and Char.IsDigit to check if you want to set e.HAndled. If e.Handled is true, the key press is ignored.

  
  
  

• Tinman

  You should set e.Handled to True, you should NOT reset the e.KeyChar as an alternative.

  
  
  

• AndrewLittlejohn

  hi,

  at the top of this forum there is a FAQ thread which has a post about restrict textbox to accept numbers only the links has currency also

  hope this helps

  
  
  

• CRathjen-MSFT

  hi,

  revised code using e.handled

  Private Sub txtTel_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTel.KeyPress

  If Char.IsLetter(e.KeyChar) Or Char.IsSymbol(e.KeyChar) Or Char.IsPunctuation(e.KeyChar) Then

  MsgBox("Only Numeric input", MsgBoxStyle.Information, "Invalid From Value")

  'e.KeyChar = ChrW(0)

  e.Handled = True

  End If

  End Sub

  ron

  
  

• panaconsultas

  Hi,

  This is how I code this in VB:

  Private Sub txtTel_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTel.KeyPress

  If Char.IsLetter(e.KeyChar) Or Char.IsSymbol(e.KeyChar) Or Char.IsPunctuation(e.KeyChar) Then

  MsgBox("Only Numeric input", MsgBoxStyle.Information, "Invalid From Value")

  e.KeyChar = ChrW(0)

  End If

  End Sub

  Hope it helps

  ron

  
  
• How to restrict character from textbox?