C # Set restrictions on the textbox like quantity, price, amount, etc., users can only enter numbers or decimals

1        #regionSet the TextBox control style and restrictions such as quantity (the method to invoke is to override or call the Shieldnumbertextboxotherkeys function directly)2 3         /// <summary>4         ///masking other strings of a digital textbox5         /// </summary>6         /// <param name= "Sender" ></param>7         /// <param name= "E" ></param>8          Public Virtual voidTboxnumbers_keydown (Objectsender, KeyEventArgs e)9         {TenE.suppresskeypress =true; One  A             Switch(E.keycode) -             { -                  Casekeys.d0: the                  Casekeys.d1: -                  CaseKEYS.D2: -                  Casekeys.d3: -                  Casekeys.d4: +                  Casekeys.d5: -                  CaseKeys.d6: +                  CaseKeys.d7: A                  CaseKeys.d8: at                  Casekeys.d9: -                  Casekeys.numpad0: -                  CaseKeys.numpad1: -                  Casekeys.numpad2: -                  Casekeys.numpad3: -                  Casekeys.numpad4: in                  CaseKEYS.NUMPAD5: -                  CaseKeys.numpad6: to                  CaseKeys.numpad7: +                  CaseKeys.numpad8: -                  Casekeys.numpad9: the                  CaseKeys.back: *                  CaseKeys.oemperiod: $                  CaseKeys.delete:Panax Notoginseng                  CaseKeys.decimal: -E.suppresskeypress =false; the                      Break; +                 default: A                      Break; the             } +         } -  $          Public Virtual voidTboxnumbers_keypress (Objectsender, KeyPressEventArgs e) $         { -TextBox Tbox = Sender asTextBox; -             Charc =E.keychar; the  -             if(C.tostring (). Equals ("."))Wuyi             { the                 if(TBox.Text.Length <=0) -e.handled =true;//the decimal point cannot be the first digit Wu                 Else -                 { About                     floatF; $                     floatOldf; -                     BOOLB1 =false, b2 =false; -B1 =float. TryParse (Tbox.text, outoldf); -B2 =float. TryParse (Tbox.text + e.keychar.tostring (), outf); A                     if(B2 = =false) +                     { the                         if(B1 = =true) -e.handled =true; $                         Else thee.handled =false; the                     } the                 } the             } -         } in  the         /// <summary> the         ///masking other strings of a digital textbox About         /// </summary> the         /// <param name= "Tbox" >textbox to block</param> the          Public Virtual voidShieldnumbertextboxotherkeys (TextBox tbox) the         { +Tbox. ImeMode =imemode.disable; -Tbox. KeyDown + =Tboxnumbers_keydown; theTbox. KeyPress + =tboxnumbers_keypress;Bayi         } the  the         #endregion

C # Set restrictions on the textbox like quantity, price, amount, etc., users can only enter numbers or decimals