I want to add 0 into barcode string ABC4DE. So the output looks like 0ABC4DE.

Here is my code.

        string nZero = "0";
        if (tbReadBarcode2.Text.Contains("rn"))
        {
            tbReadBarcode2.Text = tbReadBarcode2.Text.Replace("rn", nZero + "");
            btnReadBarcode2.Background = Brushes.Green;
            bool result = false;

With this code, the final barcode string looks like this ABC4DE0 instead of 0ABC4DE.
The “0” was added at behind instead in front.
Can anyone help?

0ABC4DE and not ABC4DE0