how to prevent js injection attack

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Hello there
I created a simple form to submit data by users,
i found that some user missed up with it and inserted 60000 record,
m not sure how he managed to insert these records in less than 5 min
my form is under .net 3.5 framework , and @page directive has validaterequest="true"
any idea how can i increase my application security!!!

Posted 24-Sep-11 23:40pm

mrcooll

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OriginalGriff · Accepted Answer · 2011-09-24T23:52:00

Without knowing how your form works, it is difficult to answer, but the basic rules are: never ever concatenate strings to form SQL commands - always use parametrized queries. I don't know how you are doing yours, but in C#, you would replace:

C#

SqlCommand cmd = new SqlCommand("INSERT INTO myTable (textColumn) VALUES ('" + myTextBox.Text + "')", con);

With

C#

SqlCommand cmd = new SqlCommand("INSERT INTO myTable (textColumn) VALUES (@TX)", con);
cmd.Parameters.AddWithValue("@TX", myTextBox.Text);