How to execute a command

Question

Execuse my beginner's question but I've not found the answer anywhere. Tell me please how to execute an SQL string that doesn't return a recordset. What I try to use conn.Execute (string.Concat ("use ", treeView1.Nodes [i].Text), null, (int) ADODB.ExecuteOptionEnum.adExecuteNoRecords); the compilator doesn't accept any type of the second parameter. Tell me please how to make working with command.