params.Add("@FileName1", "my_filename")

foreach(var param in params)
   dbCommand.Parameters.AddWithValue(param.Key, param.Value);

DbCommand dbCommand = SqlDb.GetStoredProcCommand(uspCommand);

foreach(String param in MyParameters)
{
   DbParameter ProcessedFileName = dbCommand.CreateParameter();
   ProcessedFileName.DbType = DbType.String;
   ProcessedFileName.ParameterName = param;
   ProcessedFileName.Value = pstrProcessedFileName;
   dbCommand.Parameters.Add(ProcessedFileName);
}