Send email msg only when text string does not contain any string value from external source.

Hi all, I want to send a confirmation email to user after checking if a container is one way or not (by comparing input text with a range of container numbers in an excel sheet). I basically want to show an alert in case a container # matches with excel sheet value. Else, send confirmation msg. How do I achieve this? right now,the way I have coded, it sends out confirmation email regardless. Here is my code: public void Btn_SubmitClick(Object sender, EventArgs E) { string path = @"C:\TEMP\OneWayContainers.xls"; string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;"; OleDbConnection objConn = new OleDbConnection(connStr); objConn.Open(); OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM MyRange", objConn); OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(); objAdapter1.SelectCommand = objCmdSelect; DataSet o ...