SQL Server :: Reading Xml File And Inserting Data Into A Tsql Table (no Duplicates)?

I am writing code to insert values from an xml file. I check for a duplicate before inserting and delete if there is a match. Is there a more effecient way to prevent duplicates before insert a record? my code: private void LoadFData() { SqlConnection oConn = new SqlConnection(ConnectionString); SqlCommand oCommand = new SqlCommand(); oCommand.Connection = oConn; oCommand.CommandType = CommandType.Text; oConn.Open(); // Load committee master files string[] strFiles = System.IO.Directory.GetFiles("fff", "ffff.dta", System.IO.SearchOption.AllDirectories); for (int i=0; i