private void BtnOpenFile_Click(object sender, EventArgs e) { using OpenFileDialog openFileDialog = new OpenFileDialog { Filter = OpenFileDialogFilterEnum.AllFiles.GetDescription(), FilterIndex = 2, RestoreDirectory = true }; openFileDialog.DialogResultIsOK(() => { Model.FileFullPath = openFileDialog.FileName; var fileStream = openFileDialog.OpenFile(); Model.FileContent = fileStream.ConvertToBase64(); LblFileName.Text = Model.FileName = new FileInfo(Model.FileFullPath).Name; ValidateModel(); }); openFileDialog.Dispose(); }