Error while using multiple combobox

Hi friends,

I am facing a weird issue in my application

I m making app to store the employee details with many comboboxes taking values from database at runtime.

Whenever I select any value from any of the combobox, all other combobox value collections vanishes away.

Please help...

I am using the following code:

//Get Station Names:
            dsStation = new DataSet();
            dsStation = objAddEmp.getStations();


            cbStation.DataSource = dsStation.Tables[0].DefaultView;
            cbStation.DisplayMember = "DName";

Same code with different control name and corresponding functions use the same type of code.

Please help.