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[code] con.Open(); string copyData = "INSERT INTO Changes(IP,ServerName,[Type of Server])SELECT IP,Server,Name FROM Server"; cmd = new SqlCommand(copyData, con); int returnValue = cmd.ExecuteNonQuery(); con.Close(); [/code] its obviouse theat you are trying to insert more times same data, you should try to select data from existing table with NOT IN command, that …
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