C # textbox limits input numbers

Private voidTbox_keypress (Objectsender, KeyPressEventArgs e) {            if(E.keychar = =0x20) E.keychar = (Char)0;//Disable SPACEBAR            if(E.keychar = =0x2D) && ((TextBox) sender). Text.length = =0))return;//Handling Negative numbers            if(E.keychar >0x20)            {                Try                {                    Double. Parse ((TextBox) sender). Text +e.keychar.tostring ()); }                Catch{E.keychar= (Char)0;//Handling Illegal characters                }            }        }Private voidTextbox_keypress (Objectsender, KeyPressEventArgs e) {    if(e.keychar!=8&&!char.isdigit (E.keychar)) {e.handled=true; }} or PrivatevoidTextbox_keypress (Objectsender, KeyPressEventArgs e) {    if(e.keychar!='\b'&&!char.isdigit (E.keychar)) {e.handled=true; }}Private voidTextbox1_keypress (Objectsender, System.Windows.Forms.KeyPressEventArgs e) {if(e.keychar!='\b')//This is allowed to enter the BACKSPACE bar{if((e.keychar<'0')|| (e.keychar>'9'))//This is allowed to enter 0-9 digits{e.handled=true;}}} Private voidButton1_Click (Objectsender, EventArgs e) { stringText = This. TextBox1.Text;if(Text! =NULL) MessageBox.Show (text); } Private voidTextbox1_validating (Objectsender, CancelEventArgs e) { Const stringPattern =@"^\d+\.? \d+$"; stringContent =((TextBox) sender). Text; if(!(Regex.IsMatch (content, pattern))) {errorprovider1.seterror (Control) sender,"only numbers can be entered!"); E.cancel=true; } Elseerrorprovider1.seterror (Control) sender,NULL); }Private voidTextbox1_keypress (Objectsender, System.Windows.Forms.KeyPressEventArgs e) {if(e.keychar=='.'&& This. TextBox1.Text.IndexOf (".")!=-1) {e.handled=true;}if(! ((e.keychar>= -&& e.keychar<= $) || e.keychar=='.'|| e.keychar==8) ) {e.handled=true;}} Private voidTbx_lsregcapital_keypress (Objectsender, 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; }}} using the ASCII code processing method, {if((E.keychar <= -|| E.keychar >= $) && (E.keychar! =8) && (E.keychar! = $)) e.handled=true;================48 for 0, 57 for 9, 8 for space, and 46 for decimal point}

C # textbox limits input numbers