Problem with inserting the combobox selected value of type int

Question

Hi,
I have a combobox and the value selected I want to use as a parameter. The field is of type Number in the access database, but when using the parameter for inserting the value in the database I get an error:
Unable to cast object of type 'System.Data.DataRowView' to type 'System.IConvertible'. and the code is:

int garbr = Convert.ToInt32(comboBox1.SelectedItem);
com.Parameters.AddWithValue("@Garbr", garbr);

if I write the code like:

com.Parameters.AddWithValue("@Garbr", comboBox1.SelectedItem);

I get an error:
"Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done."
in : com.ExecuteNonQuery();

and the comboBox1.SelectedItem doesn't get a value, unlike the other parameters for which I also use combobox values, but of type text (they have the correct value when debugging)

Can anybody help me please?
Thanks