How to force a file to download from a specidic path in the database table

I'm in process to write a http handler to for force download dialog box to pop up in order to download the file the following is the cotent of my code and would like to know what should I put in the code to force download the file. All the files have been uploaded in a folder in the web server and the path including the filename is stored in a table.

This code works if the document is embedded in databse table

public class DownloadHandler : IHttpHandler {
   
   public void ProcessRequest (HttpContext context) {
    string Document_ID = context.Request.QueryString["ImID"];
    SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Bdata"].ConnectionString);

    connection.Open();

    SqlCommand command = new SqlCommand("Select Document_Path from DocumentStorage where Document_ID=" + Document_ID, connection);

    SqlDataReader dr = command.ExecuteReader();

    dr.Read();

    context.Response.BinaryWrite((Byte[])dr[0]);
   
    connection.Close();

    context.Response.End();
}

    public bool IsReusable {
        get {
            return false;
        }
    }
}

However I would like to handle this code into the first one

//Write the file directly to the HTTP content output stream.
            context.Response.WriteFile(FilePath);
            context.Response.End();
            if (String.IsNullOrEmpty(filePath))
            {
                context.Response.Write("File path cannot be empty.");
                context.Response.End();
                return;
            }

            // Write back file
            context.Response.ContentType = "application/octet-stream";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=\"" + Path.GetFileName(filePath) + "\"");
            context.Response.Clear();
            context.Response.WriteFile(filePath);
            context.Response.End();
        }
        catch (Exception ex)
        {
            context.Response.Write("Failed to process your request.");
            context.Response.End();
        }

Please give me an idea....

Many thank

public class DownloadHandler : IHttpHandler {
    
   public void ProcessRequest (HttpContext context) {
    string Document_ID = context.Request.QueryString["ImID"];
    SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Bdata"].ConnectionString);

    connection.Open();

    SqlCommand command = new SqlCommand("Select Document_Path from DocumentStorage where Document_ID=" + Document_ID, connection);

    SqlDataReader dr = command.ExecuteReader();

    dr.Read();

    context.Response.BinaryWrite((Byte[])dr[0]);
   
    connection.Close();

    context.Response.End(); 
} 

    public bool IsReusable {
        get {
            return false;
        }
    }
}

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