How to make numeric or decimal to textbox in C#

Question

hi all,

how to make a textbox as numeric and decimal value allow

i have done with numeric but on decimal i got error because i allow dot thats why i got error

i want to allow dot only one time like this 1234.00

please help me as code

thanks

jinge · Answer

Use MaskTextBox, it saves you writing lots of code and give you the stable functionality.

Roei Bar · Answer

here is the code you need for decimal check: public static void ChkDecimal(System.Windows.Forms.TextBox Ctxt, System.Windows.Forms.KeyPressEventArgs x, Int16 bd, Int16 ad) { Ctxt.Text = Ctxt.Text.Trim(); if ((char.IsControl(x.KeyChar) || char.IsDigit(x.KeyChar) == true) || System.Convert.ToInt32(x.KeyChar[0]) == 46 || System.Convert.ToInt32(x.KeyChar[0]) == 45 || System.Convert.ToInt32(x.KeyChar[0]) == 8) { if (((Ctxt.Text.IndexOf(".") != -1 && x.KeyChar == ".") | (Ctxt.Text.IndexOf("-") == 0 && x.KeyChar == "-") | (Ctxt.Text.IndexOf("-") == 0 && Ctxt.SelectionStart == 0 && System.Convert.ToInt32(x.KeyChar[0]) != 8)) && Ctxt.SelectionLength == 0) { x.Handled = true; } else if (Ctxt.Text != "" && x.KeyChar == "-" && Ctxt.SelectionStart != 0) { x.Handled = true; } else { if (Ctxt.Text.IndexOf(".") != -1) { if (Ctxt.SelectionStart >= 0 && System.Convert.ToInt32(x.KeyChar[0]) != 8) { if (((((Ctxt.Text.Substring(Ctxt.Text.IndexOf(".")).Length > ad + 1 & Ctxt.SelectionStart > Ctxt.Text.IndexOf(".")) | (Ctxt.Text.Substring(0, Ctxt.Text.IndexOf(".") + 1).Length > bd & Ctxt.SelectionStart ad & Ctxt.SelectionStart > Ctxt.Text.IndexOf(".")) | (Ctxt.Text.Substring(1, Ctxt.Text.IndexOf(".")).Length > bd & Ctxt.SelectionStart selectionlength ="="> bd - 1 & x.KeyChar != "." & System.Convert.ToInt32(x.KeyChar[0]) != 8) | (Ctxt.SelectionStart > bd + 1 & x.KeyChar.ToString().Equals(".")))) | (Ctxt.Text.IndexOf("-") == -1 && Ctxt.SelectionLength == 0 && (((Ctxt.Text.Substring(0).Length > bd - 1 & x.KeyChar != "." & System.Convert.ToInt32(x.KeyChar[0]) != 8) & System.Convert.ToInt32(x.KeyChar[0]) != 45) | (Ctxt.SelectionStart > bd & x.KeyChar.ToString().Equals("."))))) { x.Handled = true; } } } } else { x.Handled = true; } }

Nilanka Dharmadasa · Answer

Please refer to this link. http://msdn.microsoft.com/en-us/library/ms229644.aspx In this code, you may have to do some minor change to allow the decimal point only once. else if (keyInput.Equals(decimalSeparator) { if (this.Text.Contains(decimalSeparator)) e.Handled = true; //This checks whether Decimal separator is already in the text and it does not allow more than one decimal places. } If this does not help me let me know please.

Kirtan Patel · Answer

Friend, Here is What you want write code in KeyPress Event of TextBox :) and friend, dont forget to mark " do you like this answer " please :) private void textBox1_KeyPress( object sender, KeyPressEventArgs e) { if (textBox1.Text == "" ) { DotEntered = false ; } if (e.KeyChar == '.' && DotEntered == false ) { e.Handled = false ; DotEntered = true ; } else if ( char .IsDigit(e.KeyChar) == true || e.KeyChar == ( char ) Keys .Back) { e.Handled = false ; } else { e.Handled = true ; } }

How to make numeric or decimal to textbox in C#

Answers (4)