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SqlConnection con = new SqlConnection();
                con.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=d:\users\vivek\documents\visual studio 2010\Projects\soft\soft\database\vks.mdf;Integrated Security=True;User Instance=True";
                string str;
                str = "insert into qualification_master (qualification_name) values('" + comboBox1.Text + "')";
                SqlCommand cmd = new SqlCommand(str, con);

what change in above code for delete data ?
Updated 4-Aug-11 0:02am

First, format your code using code blocks.
Second, use parameterized queries, your code is susceptible to SQL Injection attacks.

Here is the answer.
DELETE FROM qualification_master WHERE qualification_name = @yourValue
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Looks like you have no idea about sql queries.
str = "DELETE FROM qualification_master WHERE qualification_name = '" + comboBox1.Text + "'";

If you have primary key in table, you have to use that in where condition.

Check this for delete query.[^]

To learn sql start from here[^].
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UJimbo 4-Aug-11 6:06am    
pretty much
vivek shaushi 4-Aug-11 6:07am    
but which method i can use cmd.executenonquery or other????
Toniyo Jackson 4-Aug-11 6:09am    
koolprasad2003 4-Aug-11 6:10am    
Use ExecuteNonQuery() method which will return you Integer value.
vivek shaushi 4-Aug-11 6:10am    
thanx bro
DELETE FROM qualification_master

Trust me this will delete all the data from table. Don't use

clause and never use parametrized query in .Net.

Please guys don't post answer to these type questions.
This guy even don't know the SQL command, how can we help this guy?

He want help on SQL (subject: delete data) has a tag of C#.
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vivek shaushi 4-Aug-11 6:12am    
tari ma no bhosdo
Toniyo Jackson 4-Aug-11 6:15am    
What are you talking man? If you don't know something only you will come here. Just help him in a right way. See my answer. I given him the answer and given some links to learn sql also. We have to help new guys.
Suresh Suthar 4-Aug-11 6:21am    
Just see the comment by the guy you helped.

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