using System.Threading.Tasks;

using System.Windows.Forms;

​

namespace WindowsFormsApplication1 {

    public partial class Form1 : Form {

        public Form1() {

            InitializeComponent();

        }

​

        private ITemplateInteraction _templateInteraction = new TemplateInteraction();

​

        private async void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) {

            var result = await _templateInteraction.GetProjectTemplateFile(1,

                                                                   "en-US",

                                                                   "de-CH");

            return;

        }

    }

​

    public class TemplateInteraction : ITemplateInteraction {

        public async Task<ProjectTemplateFile> GetProjectTemplateFile(long companyId, string sourceLanguage, string targetLanguage) {

            return null;

        }

    }

​

    public interface ITemplateInteraction {

        Task<ProjectTemplateFile> GetProjectTemplateFile(long companyId, string sourceLanguage, string targetLanguage);

    }

​

    public class ProjectTemplateFile {

​

    }

}