As per your question, you have the option to incorporate '--SELECT--' at either the 0 index or the initial row of the data using this approach. Following the retrieval of data from the database, you can introduce a fresh row into the table at position zero by employing the
InsertAt
method of
DataTable.Rows
. Below is the code snippet for adding a new row:
DataSet ds = new DataSet();
da.Fill(ds, "nb");
object[] objrow = new object[] { "-1", "--SELECT--" };
DataRow row = ds.Tables["nb"].NewRow();
row.ItemArray = objrow;
ds.Tables["nb"].Rows.InsertAt(row, 0);
cbx_TypeNote.DisplayMember = "Type";
cbx_TypeNote.ValueMember = "ID";
cbx_TypeNote.DataSource = ds.Tables["nb"];
cbx_TypeNote.SelectedIndex = 0;
cbx_TypeNote.SelectedIndex = 0
to select the first row of the dropdownlist. Additionally, ensure that SelectedIndex is greater than 0 when working with the dropdown value.
Furthermore, there are a few issues and potential improvements require in your code.
1. Don't use direct queries in the code which can lead to SQL injection vulnerabilities.
2. It's better to use the
using
statement for command or connection object to ensure proper disposal of resources.