marquee med .NET C#

Kode 

while ( objDataReader.Read( ) )
{
myMarquee.Text=MarqueeIndhold;
string MarqueeIndhold = "tekst"
}

Kode 

public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        myMarquee.Text = GetMarqueeText();
    }

    private string GetMarqueeText()
    {
        string MarqueeText = "en tekst";
        return MarqueeText;
    }
}

Kode 

using System;
using System.Configuration;
using System.Collections;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ///myMarquee.Text = GetMarqueeText();
        myMarquee.Text = GetMarqueeIndhold();
    }

    private string GetMarqueeIndhold()
    {
        try
        {
            // Create a SQL command
            string strSQL = "SELECT * FROM news ORDER BY Id DESC";
            SQLServerCommand DBCmd = new SQLServerCommand(strSQL, Conn);
            SQLServerDataReader myDataReader;
            myDataReader = DBCmd.ExecuteReader();

            while (myDataReader.Read())
            {
                Console.WriteLine("Oprettet: " + myDataReader["oprettet"].ToString());
            }
            myDataReader.Close();

            //  Close the connection
            Conn.Close();
        }

        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            return;
        }
        ///string MarqueeText = "en tekst";
        ///return MarqueeText;
    }
    
}

Kode 

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: CS0246: The type or namespace name 'SQLServerCommand' could not be found (are you missing a using directive or an assembly reference?)

Source Error:

 

Line 25:             // Create a SQL command
Line 26:             string strSQL = "SELECT * FROM news ORDER BY Id DESC";
Line 27:             SQLServerCommand DBCmd = new SQLServerCommand(strSQL, Conn);
Line 28:             SQLServerDataReader myDataReader;
Line 29:             myDataReader = DBCmd.ExecuteReader();