Question

I have a simple Windows Forms application (with an Access database) with a combobox (cmbStores) that is populated in the most simple way imaginable.

Problem: I am unable to get the value of the selected item.

Here is how I am populating this combobox:

// Variable declaration
        string strQueryStores = "SELECT StoreNumber FROM tblStoresAndRegion ORDER BY StoreNumber";
        string strConnectionString = UtilityClass.GetConnectionString();
        OleDbConnection connStores;
        OleDbDataReader readerStores = null;

        connStores = new OleDbConnection(strConnectionString);

        try
        {
            connStores.Open();
            OleDbCommand sqlGetStores = new OleDbCommand(strQueryStores, connStores);

            cmbStore.Items.Clear();
            cmbStore.Items.Add("All");
            if (connStores != null)
            {
                readerStores = sqlGetStores.ExecuteReader();

                if (readerStores.HasRows)
                {
                    while (readerStores.Read())
                    {
                        cmbStore.Items.Add (Convert.ToInt32(readerStores["StoreNumber"]));
                    }
                }
            }
            cmbStore.SelectedIndex = 0;

        }

        catch (OleDbException oledblEX)
        {
            MessageBox.Show(oledblEX.Message);
        }

        finally
        {
            if (readerStores != null)
                readerStores.Close();
            if (connStores != null)
                connStores.Close();
        }

This is how I am trying to get the value of the selected item.

int nStoreNumber = Convert.ToInt32(cmbABSM.SelectedItem);

Answer 1

I know I am a little late, but this works well:

int? nStoreNumber = cmbABSM.SelectedValue as int?;
if (nStoreNumber==null)
    return;