c# code for checking special character like Ctrl c

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i define a method in c# for checking the alphanumeric and digits in textbox but i want to use Ctrl A, Ctrl C and Ctrl V in textbox for that what code we write in my method.

Posted 21-Jul-11 23:23pm

tanisha pandey

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Uday P.Singh 22-Jul-11 5:29am

not clear!! give more details

tanisha pandey 22-Jul-11 6:43am

just like we are giving a condition of alphanumeric and digit used in text box in textbox keypress event just like can i define a method to allow user to use Ctrl-C,Ctrl-V and Ctrl-A.

Sergey Alexandrovich Kryukov 23-Jul-11 0:46am

Tag it! WPF, Forms, ASP.NET, what?
--SA

5 solutions

Solution 4

check this out:

input-handling-in-winform[^]

hope it helps :)

Posted 22-Jul-11 0:56am

Uday P.Singh

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lukeer 22-Jul-11 7:29am

Link contains a hint to MaskedTextBox. My 5 for that.

Uday P.Singh 22-Jul-11 7:32am

thanks :)

Solution 1

Don't.
Simple as.

CTRL-C and CTRL-V (and CTRL-A to a certain extent) are keys combinations that the average Windows user expects to do Copy, Paste and Select All respectively. If you subvert this, then the user can easily get confused, and will grow to strongly dislike your application...

Posted 21-Jul-11 23:40pm

OriginalGriff

Solution 3

The TextBox control supports Ctrl+C and Ctrl+V without further ado. For Ctlr+A to work, you will have to check in KeyDown event handler for Ctrl key to be pressed.

MyTextBox_KeyDown( object sender, KeyEventArgs e)
{
    if( e.KeyData == ( Keys.A | Keys.Control ))
    {
        SelectAllTextInMyTextBox();
    }
}

How did you implement your check? Depending on the way you did that, it's possible that it doesn't interfere with the hotkeys at all.

Posted 22-Jul-11 0:55am

lukeer

Solution 5

Ctrl+C is not a "special character". Frankly, I don't know what's "special" character. Character is a character, Ctrl+C is not. No characters at all. This is a key combination. There are several levels of interpretation of physical key presses. Characters are produced on the very last stage. Some of them never produce any characters, like those you are asking about. Usually you process key combinations like that are captured by handling events like KeyDown and KeyUp.

—SA

Posted 22-Jul-11 18:50pm

Sergey Alexandrovich Kryukov

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MallikarjunaGupta · Accepted Answer · 2011-07-22T00:51:00

This is working in my system.

C#

Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If (IdentifySelectAllCopyPaste(e.KeyChar) = True) Then
            MsgBox("CTRL + A Or CTRL + C Or CTRL + V Not allowed.")
        End If
    End Sub
Public Function IdentifySelectAllCopyPaste(ByVal KeyChar As Char) As Boolean
        Try
            If Asc(KeyChar) = 1 Or Asc(KeyChar) = 3 Or Asc(KeyChar) = 22 Then
                If (Clipboard.ContainsData(DataFormats.Text) = True) Then
                    Clipboard.Clear()
                End If
                Return True
            Else
                Return False
            End If
        Catch ex As Exception
            MsgBox("Error", "Error", ex.Message)
            Return False
        End Try
    End Function