Calculator thousand separator by comma in C#

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C#

private void TextBox_TextChanged(object sender, EventArgs e)
    {
    string value = TextBox.Text.Replace(",", "");
    long ul;
    if (long.TryParse(value, out ul))
    {
        TextBox.TextChanged -= TextBoxTextChanged;
        TextBox.Text = string.Format("{0:#,#0}", ul);
        TextBox.SelectionStart = TextBox.Text.Length;
        TextBox.TextChanged += TextBoxTextChanged;
    }
}

I used above code for making Calculator. I want to get result by

pressing equal comma with decimal value. Normally I can type

1,234.1234 in the textBox but if I press 1,000.123 + 1,000.123

it does not give the result 2,000.246 - it gives result only

2000.246. I mean comma with decimal value not getting by

pressing equal.

Can anybody kindly please help me to solve this problem ?

What I have tried:

I used above code for making Calculator. I want to get result by

pressing equal comma with decimal value. Normally I can type

1,234.1234 in the textBox but if I press 1,000.123 + 1,000.123

it does not give the result 2,000.246 - it gives result only

2000.246. I mean comma with decimal value not getting by

pressing equal.

Can anybody kindly please help me to solve this problem ?