sqlDataAdapter.InsertCommand.CommandText="SELECT * FROM WHERE (**=@**,***=@***);
sqlDataAdapter.InsertCommand.Parameters.Add("@**",SqlDbType.VarChar,15);
sqlDataAdapter.SelectCommand.Parameters["@***"].Value=string1;
sqlDataAdapter.InsertCommand.Parameters.Add("@**",SqlDbType.VarChar,15).Value=string2;
sqlCommand.ExecuteNonQuery()