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public static string FindLanmuFieldName(string channel,string lanmu)
{
string str;
OleDbConnection con=DBConnection.getConn();
con.Open();
str="select lname from lanmu where channel='"+channel+"' and lanmu='"+lanmu+"'";
OleDbCommand com = new OleDbCommand(str, con);
OleDbDataReader dr = com.ExecuteReader(CommandBehavior.CloseConnection);
if (dr.Read())
{return dr["lname"].ToString();}
else
{return "err";}
}