How to read values from a datatable? Or just increment values...

[gggram2000]

OK here's my code:

SqlConnection dbConnection = new SqlConnection(xmldb);
SqlCommand cmd = new SqlCommand(" SELECT * FROM dbo.fnInvoiceID() ", dbConnection);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
 
int invNum = da.Fill(dt);
invNum = invNum + 1; 
 
comboBox.DataSource = dt;
comboBox.DisplayMember = "InvoiceNumber";
comboBox.ValueMember = "InvoiceNumber";

I would like to be able to put:

comboBox.DataSource = invNum;

In this manner I would get the +1 increment that I want. I succesfully obtain 13 from the function but it's supposed to be 14 since there's the max(InvoiceNumb er) Invoice. 14 will be the new Invoice...any other suggestions?
When I try:

comboBox.DataSource = invNum;

I get this error:

"Complex DataBinding accepts as a data source either an IList or an IListSource."

[gggram2000]

Well I solved it, thanks for all ur hard work.