//async keyword doesn't do anything. It's just a function decorator which indicates that this method is awaitable.
private async void RenderEmployeesAsync()
{
lblPreloader.Visible = true;
//any method that perform a tasks should be awaited.
var employees = await EmployeeDal.GetEmployeesAsync(txtAsyncSearch.Text);
bsAsyncEmployee.DataSource = employees;
lblPreloader.Visible = false;
}
private void RenderEmployees()
{
bsSyncEmployee.DataSource = EmployeeDal.GetEmployees(txtSyncSearch.Text);
}