private void openTANFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
            string TANfileName    = openFileDialog1.FileName;
            string TANfileContent = FileService.ReadFile(TANfileName);

            string configFilename = TaskAllocationFileParser.GetConfigFilename(TANfileContent);

            if (configFilename != "")
            {
                string path              = Path.GetDirectoryName(TANfileName);
                string configFilePath    = path + @"\" + configFilename;
                string configFileContent = FileService.ReadFile(configFilePath);

                initFileValidation();
                bool isTANFileValid    = validateTANFile(TANfileContent);
                bool isConfigFileValid = validateConfigFile(configFileContent);

                if (isTANFileValid && isConfigFileValid)
                {
                    displayAllocationDetails(TANfileContent, configFileContent);
                }
            }
        }