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Private Sub delete_Click(sender As System.Object, e As System.EventArgs) Handles delete.Click Try Dim con As New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=D:\JENNY PROJECT\JENNYFER\SMS project\SMS project\Database1.mdf;Integrated Security=True;User Instance=True") con.Open() Dim query As String query = "delete from course_tabl where c_name='" + ComboBox1.Text + "'" cmd = New SqlCommand(query, con) dr = cmd.ExecuteReader MessageBox.Show("Do you really want … 
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