<%@ Page language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SQLClient" %>
<script language="c#" runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
  SqlConnection cnn = new SqlConnection("server=DBSERVER;User id=USER;password=PASSWORD;database=DB");
  SqlCommand InsertCommand = new SqlCommand();
  InsertCommand.Connection = cnn;
  string sql;
  sql = "INSERT INTO TABELLA (campo) VALUES ('valore')";
  InsertCommand.CommandText = sql;
  try
  {
    cnn.Open();
    InsertCommand.ExecuteNonQuery();
  }
  catch (Exception ex)
  {
    Response.Write(ex.ToString());
  }
  finally
  {
    cnn.Close();
  }
}
</script>