Reduce size of binary image saved in database in ASP.Net

Ref:

Display image from database in Image control without using Generic Handler in ASP.Net

HTML

<asp:DropDownList ID="ddlImages" runat="server" AppendDataBoundItems="true" AutoPostBack="true"
    OnSelectedIndexChanged="FetchImage">
    <asp:ListItem Text="Select Image" Value="0" />
</asp:DropDownList>
<hr />
<asp:Image ID="Image1" runat="server" Visible="false" />

Namespaces

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

 C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        ddlImages.DataSource = GetData("SELECT Id, Name FROM tblFiles");
        ddlImages.DataTextField = "Name";
        ddlImages.DataValueField = "Id";
        ddlImages.DataBind();
    }
}

private DataTable GetData(string query)
{
    DataTable dt = new DataTable();
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand(query))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                sda.Fill(dt);
            }
        }
        return dt;
    }
}

protected void FetchImage(object sender, EventArgs e)
{
    string id = ddlImages.SelectedItem.Value;
    Image1.Visible = id != "0";
    if (id != "0")
    {
        byte[] bytes = (byte[])GetData("SELECT Data FROM tblFiles WHERE Id =" + id).Rows[0]["Data"];
        string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
        //Image1.ImageUrl = "data:image/png;base64," + base64String;
        Image1.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(MakeThumbnail(bytes, 100, 100), 0, (MakeThumbnail(bytes, 100, 100).Length));
    }
}

public static byte[] MakeThumbnail(byte[] myImage, int thumbWidth, int thumbHeight)
{
    using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
    using (System.Drawing.Image thumbnail = System.Drawing.Image.FromStream(new MemoryStream(myImage)).GetThumbnailImage(thumbWidth, thumbHeight, null, new IntPtr()))
    {
        thumbnail.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        return ms.ToArray();
    }
}

Screenshot