How to auto read qrcode using barcode scanner

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C#

MySQL

hi,
Customer request to support QRCode in my Project instead of Standered Barcode (like:- code93)
how to auto read QRCode using Barcode Scanner without using form Controls such as textbox?

What I have tried:

in this time I use this function to collect the barcode from Barcode Scanner Input
but it seem that it don't work with QRcode ( it work fine with code93 , code39,...)
Hint: the item code stored in the Database as VARCHAR(200)

private string BarCode = "";
DateTime _lastKeystroke = new DateTime(0);

private void evtKeyUpEvent(object sender, KeyEventArgs e)

{
    if (Keys.NumPad0 <= e.KeyCode && e.KeyCode <= Keys.NumPad9)
    {
        BuildBarCode((e.KeyCode - Keys.NumPad0).ToString());
    }
    else if (Keys.D0 <= e.KeyCode && e.KeyCode <= Keys.D9)
    {

        BuildBarCode((e.KeyCode - Keys.D0).ToString());
    }
    if (65 <= e.KeyValue && e.KeyValue <= 90)
    {
        BuildBarCode((e.KeyCode).ToString());
    }
    else if (Keys.ShiftKey == e.KeyCode)
    {
    }
    else if (Keys.OemPeriod == e.KeyCode)
    {
        BuildBarCode(".");
    }
    else if (Keys.Multiply == e.KeyCode)
    {
        BuildBarCode("*");
    }
    else if (Keys.Add == e.KeyCode)
    {
        BuildBarCode("+");
    }
    else if (Keys.Separator == e.KeyCode)
    {
        BuildBarCode("|");
    }
    else if (Keys.Subtract == e.KeyCode)
    {
        BuildBarCode("-");
    }
    else if (Keys.Divide == e.KeyCode)
    {
        BuildBarCode("/");
    }
    else if (Keys.Separator == e.KeyCode)
    {
        BuildBarCode(",");
    }
    else if (Keys.Separator == e.KeyCode)
    {
        BuildBarCode(",");
    }

    else if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Return)
    {
        updateUIBarCode(BarCode);
    }
}
private void BuildBarCode(string value)
{
    BarCode = string.Concat(BarCode, value);
}

public void updateUIBarCode(string i)
{
    AddNewRowWithCode(i);
}

I searched in Google but all of the result explain how to read the Image and convert it to text. can you guide me how to imporve my fuction to support QRcode or how to achieve my goal ?