How to open new window with width and height - using window.open

  <a href="#" onclick="MyWindow=window.open('https://www.aspsnippets.com/Articles/660/Display-image-from-database-in-Image-control-without-using-Generic-Handler-in-ASPNet/','MyWindow','width=600,height=300'); ">click to open new window</a>

How to view the image in browser from database - binary image from database - asp.net

  string alert1 = "var image = new Image();";

        alert1+= "image.src='data:image/jpg;base64,"+ Convert.ToBase64String(bytes)+"';";

        alert1 += "var w = window.open('');";

              alert1+= "w.document.write(image.outerHTML);";

           ScriptManager.RegisterStartupScript(this, this.GetType(), "OpenNewTabScript", alert1, true);

ref:-https://stackoverflow.com/questions/27798126/how-to-open-the-newly-created-image-in-a-new-tab

System.InvalidOperationException: ExecuteScalar: Connection property has not been initialized.

 This error comes when you write below code:-

using (SqlCommand cmd=new SqlCommand("SELECT TOP 1 [FileID]  FROM [UploadFiles] order by Fileid desc"))

and not passed con as second parameter in SqlCommand. Use below code

using (SqlCommand cmd=new SqlCommand("SELECT TOP 1 [FileID]  FROM [UploadFiles] order by Fileid desc", con))

also you have to add below line

cmd.CommandType = System.Data.CommandType.Text;

How to display binary images from database - How to view images from database - view binary images - asp.net c# - How to download file from database

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;

    }

}

ref:- https://www.aspsnippets.com/Articles/660/Display-image-from-database-in-Image-control-without-using-Generic-Handler-in-ASPNet/ 

How to run background music in website - HTML

 https://www.tutorialspoint.com/how-to-add-background-music-to-your-web-page