I have this code, and i have some field in this combo box but i can get any information after search

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I have this code, and I have some field in this combo box but I can get any information after search .

sql = "SELECT * FROM Reg_info where '" + comboBox2.Text+ "'='" + textBox4.Text + "'";

What I have tried:

sql = "SELECT * FROM Reg_info where '" + comboBox2.Text+ "'='" + textBox4.Text + "'";

Posted 11-Feb-16 7:37am

Adam_adam

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Sergey Alexandrovich Kryukov 11-Feb-16 13:59pm

And the question is?...
Your code is just SQL, it has nothing to do with combo box...
—SA

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OriginalGriff · Accepted Answer · 2016-02-11T08:09:00

First off, don't do that. Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.
You are probably OK with the Combobox - but check it, very, very carefully - if it's not a fixed list then you are going to have to sanitise it damn carefully. The text box is a definate no-no - any user with access to it and a keyboard can destroy your DB just by typing...

But as to why you get nothing useful - it's probably your use of quotes around the column name. That turns it into a string, and means that unless the text box contains exactly the same string the query will never return any records.
Remove the quotes, check and sanitize your combobox, and parameterise your textbox.
It should start to work then.

Member 10299393 · Accepted Answer · 2016-02-11T08:08:00

Solution 1

plese remove single quotation from where combobox2.text.just use below
like as
sql = "SELECT * FROM Reg_info where " + comboBox2.Text+ " ='" + textBox4.Text + "'";

Posted 11-Feb-16 8:08am

Member 10299393

Comments

Adam_adam 11-Feb-16 14:15pm

Thanks I did it..