couldnt save to access database c# : the values staring vith cmb is a combo box.
when i click the save button it throws an error 
my code is below

`cn.Open();`
`OleDbCommand command = new OleDbCommand();`
`command.Connection = cn;`
`command.CommandText = "insert into TblProductDetails(ProductID,ProductName,Category,Section,UOM,CostPrice,SellingPrice1,SellingPrice2,DiscountPercentage,DiscountAmount,MinimumPrice,Vendor,Stock) values ('" + txtProductID.Text + "','" + txtName.Text + "','" + category + "','" + section + "','" + uom + "','" + txtCostprice.Text + "','" + txtSellingPrice1.Text + "','" + txtSellingPrice2.Text + "','" + txtDiscountpercentage.Text + "','" + txtDiscountAmount.Text + "','" + txtMinimumPrice.Text + "','" + vendor + "','" + txtBeginingStock.Text + "')";`
`command.ExecuteNonQuery();`
`cn.Close();`
