delete row from DataGrid and EF table

[zleug]

Hi All.

The UI layer has DataGrid one of the column has delete button. That is method that I try to delete DataGrid row

private void DeleteEmployee_BTn_Click(object sender, RoutedEventArgs e)
{
if (!(Employee_DG.SelectedValue == null))
{
if (MessageBox.Show("Are you sure you want to delete", "Are you sure?", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes)
{
int empid = (int) Employee_DG.SelectedValue;
ProjectAdapter.DeleteEmployee(empid);
}
}
}

When I run application and hit Delete button in line
int empid = (int) Employee_DG.SelectedValue;

I got error message:
System.InvalidCastExeptions: 'Specified cast is not valid.'

When I'm gebugging step by step and check value in SelectedValue it displays rows values. How modify the code to retrieve only EmployeeId value?

Thanks.

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