do not want to repeat my code again and again

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ASP.NET

I have three files one is class filedownload.cs in which i have three functions...GetFileLIST() savefile() and GetaFile().second file is GetFile.aspx and third is form in which code is behind button.using all these files i am uploading a file and showing in gridview and it is working for me.but now i have another form in which i want to use the code for uploading file.but for another form i have to repeat all these code because of query because i have differet table now...
please resolve this problem to make my code short and not to repeat....

filedownload.cs

  public static DataTable GetFileList()
        {
            DataTable dt=new DataTable();
            using (SqlConnection con = new SqlConnection())
            {
                OpenConnection(con);
                SqlCommand com = new SqlCommand();
                com.Connection = con;
                com.CommandTimeout = 0;
                com.CommandText = "SELECT ID, Name, [Content], size FROM Connectivity";
                com.CommandType = CommandType.Text;
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = com;
                da.Fill(dt);
                con.Close();
            }
               


            
            return dt;

        }
        public static void savefile(string name, string content, int size, byte[] data)
        {
            using (SqlConnection con = new SqlConnection()) 
            {
                OpenConnection(con);
                SqlCommand com = new SqlCommand();
                com.Connection = con;
                com.CommandTimeout = 0;
                string ct = "INSERT INTO Connectivity VALUES (@name,@content,";
                ct = ct + "@size,@data)"; // want different query for diffrent table
                com.CommandText = ct;
                com.CommandType = CommandType.Text;
                com.Parameters.Add("@name", SqlDbType.VarChar, 50);
                com.Parameters.Add("@content", SqlDbType.VarChar, 50);
                com.Parameters.Add("@size", SqlDbType.Int);
                com.Parameters.Add("@data", SqlDbType.VarBinary);

                com.Parameters["@Name"].Value = name;
                com.Parameters["@content"].Value = content;
                com.Parameters["@size"].Value = size;
                com.Parameters["@data"].Value = data;
                com.ExecuteNonQuery();
                con.Close();


            }
        }
        public static DataTable Getafile(int id)
        {
            DataTable dt = new DataTable();
            using (SqlConnection con = new SqlConnection())
            {
                OpenConnection(con);
                SqlCommand com = new SqlCommand();
                com.Connection = con;
                com.CommandTimeout = 0;
                com.CommandText = "SELECT ID, Name, [Content], size, data FROM Connectivity where ID=@ID";
                com.CommandType = CommandType.Text;
                SqlDataAdapter da = new SqlDataAdapter();
                com.Parameters.Add("@ID", SqlDbType.Int);
                com.Parameters["@ID"].Value = id;
                da.SelectCommand = com;
                da.Fill(dt);
                con.Close();


            }
            return dt;
        }

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