Several common methods for entering numbers in a Winform textbox (C #)

Method one: private void Tbox_keypress (object sender, KeyPressEventArgs e) {if (E.keychar = = 0x20) E.keychar  = (char) 0; Disables the SPACEBAR if ((E.keychar = = 0x2D) && ((TextBox) sender).   Text.length = = 0)) return; Handle negative if (E.keychar > 0x20) {try {D Ouble. Parse ((TextBox) sender).                  Text + e.keychar.tostring ());   } catch {E.keychar = (char) 0;    Handle illegal Characters}}} method two: 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; }} method Three: private void Textbox1_keypress (object sender, System.windowS.forms.keypresseventargs e) {if (e.keychar!= ' \b ')//This is the Allow input backspace key {if ((e.keychar< ' 0 ') | | (e.keychar> ' 9 '))  This is allowed to enter 0-9 digits {e.handled = true; }}} method four: private void Textbox1_validating (object sender, CancelEventArgs e) {const string pattern = @ "^\d+\ .?   \d+{1}quot;; String content = ((TextBox) sender).     Text; if (! (   Regex.IsMatch (content, pattern)) {errorProvider1.SetError (Control) sender, "can only enter numbers!");   E.cancel = true;   } else errorProvider1.SetError ((Control) sender, NULL);  } method Five: 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; }} method Six: 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;//eliminate inappropriate 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; }}} method seven: Using ASCII code processing, {if (E.keychar <= | | e.keych  Ar >=57) && (E.keychar! = 8) && (E.keychar =)) e.handled = true;  ================48 for 0, 57 for 9, 8 for spaces, and 46 for decimal 

Several common methods of entering numbers in a Winform textbox (C #)