ASP.Net file upload to sql server 2008 Database

Server Error in '/' Application.
Incorrect syntax near '@Document'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Incorrect syntax near '@Document'.

Source Error:

Line 68:                 cmd.Parameters["@Size"].Value = size;
Line 69:                 cmd.Parameters["@Document"].Value = fileData;
Line 70:                 cmd.ExecuteNonQuery();
Line 71: 
Line 72:                 connection.Close();


Source File: C:\Users\CBS\documents\visual studio 2010\Projects\Mcases\Mcases\Utilities.cs    Line: 70

Stack Trace:

public static void SaveFile(string name, string contentType, int size, byte[] fileData)
       {
           using (SqlConnection connection = new SqlConnection())
           {
               OpenConnection(connection);
               SqlCommand cmd = new SqlCommand();
               cmd.Connection = connection;
               cmd.CommandTimeout = 0;

               string commandText = "INSERT INTO Document VALUES(@FileName, @ContentType,@Size,@Document)";
               commandText = commandText + "@Document";
               cmd.CommandText = commandText;
               cmd.CommandType = CommandType.Text;

               cmd.Parameters.Add("@FileName", SqlDbType.VarChar);
               cmd.Parameters.Add("@ContentType", SqlDbType.VarChar, 50);
               cmd.Parameters.Add("@size", SqlDbType.Int);
               cmd.Parameters.Add("@Document", SqlDbType.VarBinary);

               cmd.Parameters["@FileName"].Value = name;
               cmd.Parameters["@ContentType"].Value = contentType;
               cmd.Parameters["@Size"].Value = size;
               cmd.Parameters["@Document"].Value = fileData;
               cmd.ExecuteNonQuery();

               connection.Close();
           }
       }

protected void btnUpload_Click(object sender, EventArgs e)
       {
           HttpFileCollection files = Request.Files;
           foreach (string fileTagName in files)
           {
               HttpPostedFile file = Request.Files[fileTagName];
               if (file.ContentLength > 0)
               {
                   // Due to the limit of the max for a int type, the largest file can be
                   // uploaded is 2147483647, which is very large anyway.
                   int size = file.ContentLength;
                   string name = file.FileName;
                   int position = name.LastIndexOf("\\");
                   name = name.Substring(position + 1);
                   string contentType = file.ContentType;
                   byte[] fileData = new byte[size];
                   file.InputStream.Read(fileData, 0, size);

                   Utilities.SaveFile(name, contentType, size, fileData);
               }
           }
           }