Sum Total of two TextBox

You must convert the textual values to a numeric type in order to perform arithmetic on them. I typically suggest using one of the TryParse methods for this because you get validation that the values actually represent numbers before trying to work arithmetic against them. For example:

decimal decTotal = 0;
decimal decTop = 0;

if (decimal.TryParse(txtTotal.Text, out decTotal) &&
    decimal.TryParse(txtTop.Text, out decTop))
{
    txtTotal.Text = (decTotal + decTop).ToString();
}
else
{
    MessageBox.Show("Invalid value(s)!");
}

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Thanks a lot Kaufmed, you gave perfect solution which I spent a lot of time... but could you extent your help? I need to have format for this like this 12,440.83

Fast and Perfect... Thanks a lot!