Deleting multiple rows from a table

Question

I have a table and I want to delete all rows with a specific card serial . There are multiple rows with the same card serial .So I wrote this code but it seems that's not working:

try
{
using (SqlConnection con = new SqlConnection(WF_AbsPres.Properties.Settings.Default.DbConnectionString))
{
   con.Open();
   SqlCommand command2 = new SqlCommand("DELETE  FORM DevInOut where Cardserial='" + textBox5.Text + "'", con);
   command2.ExecuteNonQuery();
   con.Close();
}
}
   catch (SqlException ex)
{
}

how can assure all the rows will be deleted . Should I use procedure? How do I use procedure?

Answer 1

Change your FORM to FROM .

And please always use parameterized queries instead. This kind of string concatenations are open for SQL Injection attacks.

using (SqlConnection con = new SqlConnection(WF_AbsPres.Properties.Settings.Default.DbConnectionString))
{
   con.Open();
   SqlCommand command2 = new SqlCommand("DELETE FROM DevInOut where Cardserial=@Cardserial", con);
   commdand2.Parameters.AddWithValue("@Cardserial", textBox5.Text);
   command2.ExecuteNonQuery();
   con.Close();
}

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