what is problem with 's in sql query

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i have comment textbox.And it is working perfectly.when i enter text in textbox of comment data inserted sucessfully in database table.But if i use 's in writing comment in textbox,it will give me error.I know perfectly that it is error because of 's.what coding is require to solve this problem?

SqlCommand cmd = new SqlCommand("insert into table (name,address,comment) values('" + txtname.text + "','" + txtaddress.text + "','"+txtcomment.text+"')", cnn);

Posted 17-Jan-13 7:41am

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**R. Giskard Reventlov** · Accepted Answer · 2013-01-17T07:46:00

Solution 1

Basically, you need to double it up.

Try something like:

C#

txtcomment.Text.Replace("'", "''");

That is very simplistic and you should research the reasons behind this and come up with a solution that fits your specific needs.

Posted 17-Jan-13 7:46am

R. Giskard Reventlov

Updated 17-Jan-13 7:47am

v2

Comments

Sergey Alexandrovich Kryukov 17-Jan-13 17:02pm

My 5, for leaving OP some room for further work. :-)
—SA

fjdiewornncalwe 17-Jan-13 17:13pm

+5.

adriancs 17-Jan-13 22:11pm

To understand the need of doing this,
Try execute this:

string name = "anyname";
string address = "anyaddress";
string comment = "anycomment'); DROP TABLE IF EXISTS `table`; SELECT ('surprise";

SqlCommand cmd = new SqlCommand("insert into table (name,address,comment) values('" + name + "','" + address + "','" + comment + "')", cnn);

It's called SQL Injection.

Member 9511889 19-Jan-13 1:01am

where this code i have to write?

R. Giskard Reventlov 19-Jan-13 10:03am

It's in the solution. Think about it.