Hi Vanessa,

I have created the sample using the below article.

Dynamically generate and display QR code Image in ASP.Net

Save and Retrieve images from database in ASP.Net

Download QR Code package

You will need to install the QRCoder package using the following command.

Install-Package QRCoder -Version 1.4.3

HTML

<asp:Button Text="Save" runat="server" OnClick="OnSave" />
<hr />
<asp:GridView ID="gvImages" runat="server" AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Image Id" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:TemplateField HeaderText="Image">
            <ItemTemplate>
                <asp:Image ID="Image1" runat="server" Height="200" Width="200" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using QRCoder;
using System.Drawing;
using System.IO;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

VB.Net

Imports QRCoder
Imports System.Drawing
Imports System.IO
Imports System.Configuration
Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection conn = new SqlConnection(constr))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM tblFiles", conn))
            {
                DataTable dt = new DataTable();
                sda.Fill(dt);
                gvImages.DataSource = dt;
                gvImages.DataBind();
            }
        }
    }
}

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DataRowView dr = (DataRowView)e.Row.DataItem;
        string imageUrl = "data:image/jpg;base64," + Convert.ToBase64String((byte[])dr["Data"]);
        (e.Row.FindControl("Image1") as System.Web.UI.WebControls.Image).ImageUrl = imageUrl;
    }
}

protected void OnSave(object sender, EventArgs e)
{
    PayloadGenerator.ContactData generator = new PayloadGenerator.ContactData(PayloadGenerator.ContactData.ContactOutputType.VCard3,
            "Dharmendra", "Das", "Dharmendra", "9999999999", "8888888888", "022-9999999", "name@gmail.com",
            new DateTime(2000, 01, 01), "https://www.aspsnippets.com/", "", "G-106", "Mumbai", "400097", "India", "", "Maharashtra");
    QRCodeGenerator qrGenerator = new QRCodeGenerator();
    QRCodeData qrCodeData = qrGenerator.CreateQrCode(generator.ToString(), QRCodeGenerator.ECCLevel.Q);
    QRCode qrCode = new QRCode(qrCodeData);
    using (Bitmap bitMap = qrCode.GetGraphic(20))
    {
        using (MemoryStream ms = new MemoryStream())
        {
            bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
            byte[] byteImage = ms.ToArray();
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(constr))
            {
                string sql = "INSERT INTO tblFiles VALUES(@Name, @ContentType, @Data)";
                using (SqlCommand cmd = new SqlCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@Name", "Dharmendra");
                    cmd.Parameters.AddWithValue("@ContentType", "image/png");
                    cmd.Parameters.AddWithValue("@Data", byteImage);
                    conn.Open();
                    cmd.ExecuteNonQuery();
                    conn.Close();
                }
            }

            Response.Redirect(Request.Url.AbsoluteUri);
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using conn As SqlConnection = New SqlConnection(constr)
            Using sda As SqlDataAdapter = New SqlDataAdapter("SELECT * FROM tblFiles", conn)
                Dim dt As DataTable = New DataTable()
                sda.Fill(dt)
                gvImages.DataSource = dt
                gvImages.DataBind()
            End Using
        End Using
    End If
End Sub

Protected Sub OnRowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim dr As DataRowView = CType(e.Row.DataItem, DataRowView)
        Dim imageUrl As String = "data:image/jpg;base64," & Convert.ToBase64String(CType(dr("Data"), Byte()))
        TryCast(e.Row.FindControl("Image1"), System.Web.UI.WebControls.Image).ImageUrl = imageUrl
    End If
End Sub

Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim generator As PayloadGenerator.ContactData = New PayloadGenerator.ContactData(PayloadGenerator.ContactData.ContactOutputType.VCard3,
            "Dharmendra", "Das", "Dharmendra", "9999999999", "8888888888", "022-9999999", "name@gmail.com",
            New DateTime(2000, 1, 1), "https://www.aspsnippets.com/", "", "G-106", "Mumbai", "400097", "India", "", "Maharashtra")
    Dim qrGenerator As QRCodeGenerator = New QRCodeGenerator()
    Dim qrCodeData As QRCodeData = qrGenerator.CreateQrCode(generator.ToString(), QRCodeGenerator.ECCLevel.Q)
    Dim qrCode As QRCode = New QRCode(qrCodeData)
    Using bitMap As Bitmap = qrCode.GetGraphic(20)
        Using ms As MemoryStream = New MemoryStream()
            bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
            Dim byteImage As Byte() = ms.ToArray()
            Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
            Using conn As SqlConnection = New SqlConnection(constr)
                Dim sql As String = "INSERT INTO tblFiles VALUES(@Name, @ContentType, @Data)"
                Using cmd As SqlCommand = New SqlCommand(sql, conn)
                    cmd.Parameters.AddWithValue("@Name", "Dharmendra")
                    cmd.Parameters.AddWithValue("@ContentType", "image/png")
                    cmd.Parameters.AddWithValue("@Data", byteImage)
                    conn.Open()
                    cmd.ExecuteNonQuery()
                    conn.Close()
                End Using
            End Using

            Response.Redirect(Request.Url.AbsoluteUri)
        End Using
    End Using
End Sub

Screenshots

Generated QRCode savedin database

Data after Scanning