update query executed but record not updated

Question

Hi all,

 

   

Iam doing one task where i want to executed update query i have table name is Medicine_Available_Detail here iam storing total medicine available column name is Availability,I have one datagridview where im putting Quantity of that Medicine after user enter Quantity of particular medicine then it table update as Availability-Quantity for that medicine i written a code but its executed but record not updated

 

private void dataGridView1_RowLeave(object sender, DataGridViewCellEventArgs e)

{

int quantity = Convert.ToInt16(dataGridView1.Rows[e.RowIndex].Cells["Quantity"].Value);

 

cmd = new OleDbCommand("update Medicine_Available_Detail set [Availability]=[Availability]-@Quantity where [Medicine_Name]=@Medicine_Name", con);

cmd.Parameters.AddWithValue("@Quantity", quantity);

cmd.Parameters.AddWithValue("@Medicine_Name", medicinename);

 

con.Open();

int n = cmd.ExecuteNonQuery();

con.Close();

}