How to use the varchar data type in c#? -


i have piece of code , want make varchar not string. appropriate syntax in c#

 string emri = row["nome"].tostring();

i have query have run , use emri in , compare column in table have created in mysql. column in mysql of type varchar(20). when execute code gives error in query , guessing maybe reason 

i have query  string query = "if not exists(select * clienti codcliente=   " + id + "  , nome = '" + emri + "' , ragionesociale=' " + ragsoc + " ' , partitaiva=' " + piva + " ') insert clienti values(" + id + " ,' " + emri + " ',' " + ragsoc + " ',' " + piva + " ') else update clienti set( " + id + " ,' " + emri + " ',' " + ragsoc + " ',' " + piva + " ')";

and gives me problem 

you have error in sql syntax; check manual corresponds mysql server version right syntax use near 'if not exists(select * clienti codcliente=   1  , nomecliente = 'jo' @ line 1

there no varchar type in c#.

a varchar pretty string (of variable length in sql, obviously), have fine.


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