Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1010: Newline in constant Source Error:

Line 45:             {
Line 46:                 sqlconn.Open();
Line 47:                 sqlcmd = new SqlCommand("backup database TutorialsPanel to disk='" + backupDestination + "\" + DateTime.Now.ToString("ddMMyyyy_HHmmss") + ".Bak'", sqlconn);
Line 48:                 sqlcmd.ExecuteNonQuery();
Line 49:                 //Close connection

namespace sql_backup
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        SqlConnection sqlconn = new SqlConnection(@"Data Source=(localdb)\Projects;Initial Catalog=Cascading_ddl;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False");
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void btnBackup_Click(object sender, EventArgs e)
        {
           SqlConnection sqlconn = new SqlConnection(@"Data Source=(localdb)\Projects;Initial Catalog=Cascading_ddl;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False");
            SqlCommand sqlcmd = new SqlCommand();
            SqlDataAdapter da = new SqlDataAdapter();
            DataTable dt = new DataTable();

            // Backup destibation
            string backupDestination = @"C:\SQLBackUpFolder";

            // check if backup folder exist, otherwise create it.
            if (!System.IO.Directory.Exists(backupDestination))
            {
                System.IO.Directory.CreateDirectory(@"D:\SQLBackUpFolder");
            }
            try
            {
                sqlconn.Open();
                sqlcmd = new SqlCommand("backup database TutorialsPanel to disk='" + backupDestination + "\" + DateTime.Now.ToString("ddMMyyyy_HHmmss") + ".Bak'", sqlconn);
                sqlcmd.ExecuteNonQuery();
                //Close connection
                sqlconn.Close();
                Response.Write("Backup database successfully");
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }
    }
}