Using system.text .regulaarXpress;
private void txtChequeCode_KeyDown (object sender, System.Windows.Forms.KeyEventArgs e) {if (e.KeyCode == Keys.Enter) {if (Regex.Match (this.txtChequeCode .Text .Trim (), @ "^ / d $ "). Success) {this.txtchequesum .focus (); this.txtChequesum .select ();} else {messagebox.show (" Influence!, Only allow input numbers ");}}}
private void txtChequeSum_KeyDown (object sender, System.Windows.Forms.KeyEventArgs e) {if (e.KeyCode == Keys.Enter) {if (Regex.Match (this.txtChequeSum .Text .Trim (), @ "^ / d $ "). Success) {this.buttonsave .focus (); this.buttonsave .select ();} else {messagebox.show (" Input invalid!, Only allow input numbers ");}}}
