Executing a stored procedure using a DbConnection

I need to execute a stored procedure on a database. This is what I got so far that works:

protected DbProviderFactory dbProviderFactory;
this.dbProviderFactory = DalFactory.GetFactory(this.adapterConfiguration);

DbConnection dbConnection = dbProviderFactory.CreateConnection();

dbConnection.ConnectionString = this.adapterConfiguration.DatabaseInformation.ExternalDatabaseInformation.connectionString;
            try
            {
                dbConnection.Open();
            }
            catch (Exception e)
            {

                throw;
            }

I suspect that DbCommand would do it, but haven't found anything working. Let's say that the stored procedure by the name "initialize" has to be executed. How do I do that?

For SqlServer, this could be like this :

DbCommand command = new SqlCommand();
command.CommandType = System.Data.CommandType.StoredProcedure;
command.CommandText = "<your stored proc>";
command.Connection = dbConnection;

SqlParameter param1 = new SqlParameter("<your parameter>", MyVar);
command.Parameters.Add(param1);
//[...]

SqlParameter returnValue = new SqlParameter("ReturnValue", User);
returnValue.Direction = System.Data.ParameterDirection.ReturnValue;
command.Parameters.Add(returnValue);

command.Connection.Open();
command.ExecuteNonQuery();
int result = (int)command.Parameters["ReturnValue"].Value;
command.Connection.Close();