private void txtSrchFarmer_TextChanged(object sender, TextChangedEventArgs e)
{
if(_vm ==null)
_vm = DataContext as ListFarmersViewModel;
TextBox txtBox = sender as TextBox;
_vm.FilterFarmersCommand.Execute(txtBox.Text);
}
public ListFarmers()
{
InitializeComponent();
_vm = this.DataContext as ListFarmersViewModel;
}