am using asp:content pages binded dropdown list selected item unable to insert in DB

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ASP.NET

hai,

am using asp:content pages binded dropdown list selected item unable to insert in DB

but when am using under Default.aspx with HTML code under it is working properly

can i get any help regarding this.

con.Open();
            qry = "insert into dtdc_ititemmaster (Machine_Sr_no,Model,Type,Make,AMC_Date,Warranty_Date,Dept,User_Name,Identification,IP,Configuration,AMC_Vendor,PO_NO,PO_Date,Remarks) values('" +txtmachineno.Text+ "','" + txtmodel.Text  + "','" + droptype.SelectedItem + "','" + txtmake.Text + "','" + txtamc.Text+ "','" + txtwrrwnty.Text + "','" +dropdept.SelectedItem + "','"+txtuname.Text+"','"+txtidenty.Text+"','"+txtipadd.Text+"','"+txtconfg.Text+"','"+txtamcvndr.Text+"','"+txtpono.Text+"','"+txtpodate.Text+"','"+txtremark.Text+"')";
            SqlCommand cmd = new SqlCommand(qry, con);
            cmd.ExecuteNonQuery();