TextBox in C# separator for thousands when typing

Question

Hello,

Do you know how to do that when you type numbers in a TexBox in c# there is the separator of thousands?

Example : I type 100000 and at the end of the input I get 100 000

Answer 1

You can add TextChanged event and do something like this (to be improved...) :

        private void textBox1_TextChanged(object sender, EventArgs e)  
        {  
            if (!string.IsNullOrEmpty(textBox1.Text))  
            {  
                System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();  
                nfi.NumberGroupSeparator = " ";  
                double nValue = 0;  
                bool bError = false;  
                try  
                {  
                     nValue = double.Parse(textBox1.Text, System.Globalization.NumberStyles.AllowThousands, nfi);  
                }  
                catch (System.Exception se)  
                {  
                    bError = true;  
                    System.Windows.Forms.MessageBox.Show("Error : " + se.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);  
                }  
                finally  
                {  
                    //if (!bError)  
                    {  
                        textBox1.Text = string.Format(nfi, "{0:N0}", nValue);  
                        textBox1.Select(textBox1.Text.Length, 0);  
                    }                     
                }  
            }  
        }  

Answer 2

I'm sorry for the delay because I didn't know that you had replied and yet I was watching your reply. Your answer was hidden (you had to click on see more to display your answer)

I don't really understand your answer... what do you have to do to type the thousand separator with a "." like in your Gif?

Answer 3

Hello and thank you,

Here is the project, I removed the other calculations to make it simple

I did the test with the button "MontantDuTradeTextBox.Text" but there is a bug when I enter a "."

https://1drv.ms/u/s!AtJNthPjjq-fhF03iCnuYMvdsDLN