private void DeleteOperationsButton_OnClick(object sender, RoutedEventArgs e)
{
IList selectedOperations = OperationsDataGrid.SelectedItems;
int operationsSize = selectedOperations.Count;
for (var i = 0; i < operationsSize; i++)
{
DataRowView row = (DataRowView)OperationsDataGrid.SelectedItems[i];
string textId = row["Id"].ToString();
int id = Convert.ToInt32(textId);
_client.DeleteOperation(id);
}
OperationsTabItem_OnLoaded(sender, e);
}