C # common methods for inputting only numbers in Textbox (C #)

You can only enter numbers in Textbox (C #)

Private void tbox_keypress (Object sender, keypresseventargs E)
{
If (E. keychar = 0x20) E. keychar = (char) 0; // disable the Space key
If (E. keychar = 0x2d) & (textbox) sender). Text. Length = 0) return; // process negative numbers
If (E. keychar> 0x20)
{
Try
{
Double. parse (textbox) sender). Text + E. keychar. tostring ());
}
Catch
{
E. keychar = (char) 0; // handle invalid characters
}
}
}

Private void textbox_keypress (Object sender, keypresseventargs E)
{
If (E. keychar! = 8 &&! Char. isdigit (E. keychar ))
{
E. Handled = true;
}
}
Or private void textbox_keypress (Object sender, keypresseventargs E)
{
If (E. keychar! = '\ B '&&! Char. isdigit (E. keychar ))
{
E. Handled = true;
}

}

Private void textbox1_keypress (Object sender, system. Windows. Forms. keypresseventargs E)
{
If (E. keychar! = '\ B') // This indicates that the backspace key is allowed.
{
If (E. keychar <'0') | (E. keychar> '9') // This is a 0-9 number.
{
E. Handled = true;
}
}
}

Private void button#click (Object sender, eventargs E)
{
String text = This. textbox1.text;
If (text! = NULL)
MessageBox. Show (text );
}

Private void textbox1_validating (Object sender, canceleventargs E)
{
Const string pattern = @ "^ \ D + \.? \ D + $ ";
String content = (textbox) sender). text;

If (! (RegEx. ismatch (content, pattern )))
{
Errorprovider1.seterror (Control) sender, "only numbers can be entered! ");
E. Cancel = true;
}
Else
Errorprovider1.seterror (Control) sender, null );
}

Private void textbox1_keypress (Object sender, system. Windows. Forms. keypresseventargs E)
{
If (E. keychar = '.' & this. textbox1.text. indexof (".")! =-1)
{
E. Handled = true;
}

If (! (E. keychar> = 48 & E. keychar <= 57) | E. keychar = '.' | E. keychar = 8 ))
{
E. Handled = true;
}

}

Private void tbx_lsregcapital_keypress (Object sender, keypresseventargs E)
{
If (! Char. isnumber (E. keychar )&&! Char. ispunctuation (E. keychar )&&! Char. iscontrol (E. keychar ))
{
E. Handled = true; // remove unsuitable characters
}
Else if (char. ispunctuation (E. keychar ))
{
If (E. keychar! = '.' | This. textbox1.text. Length = 0) // decimal point
{
E. Handled = true;
}
If (textbox1.text. lastindexof ('.')! =-1)
{
E. Handled = true;
}
}
}

ASCII code,
{

If (E. keychar <= 48 | E. keychar> = 57) & (E. keychar! = 8) & (E. keychar! = 46 ))
E. Handled = true;
=======================48 represents 0, 57 represents 9, 8 represents space, 46 represents the decimal point
}

From: http://bbs.bccn.net/thread-205138-1-1.html