How to use two displays or two monitors with one mouse

>Right click on desktop

 >Go to display settings

> and there is option of "Duplicate these videos", "Extend these videos" and click on Extend these videos , it will work for both monitors.

and use "microsoft without borders" for two different computers and having same mouse.

How to open binary file from database on browser- only display

 byte[] bytes =   file.FileData;

Response.Clear();

    Response.ContentType = file.ContentType;

Response.BinaryWrite(bytes);

https://www.aspsnippets.com/questions/206135/Open-Show-Base64-PDF-data-in-new-window-Tab-using-C-and-VBNet-in-ASPNet/

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;