Dll cant Compile.

Question

I Used Mysql Database in project.

for reference add i add from .net.

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using System.IO;

using System.Configuration;

using MySql.Data.MySqlClient;

namespace adwebsite

{

    public partial class Photo : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            string con = string.Format("Server=180.00.000.00;Uid=*******;Pwd=*******;Database=*******;");
}
    }
}
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In Local its run Complete and it fetch complete data.

but when i upload in hosting server it occur Compilation Error.

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

Line 14 : using MySql.Data.MySqlClient;