to add and multiply textbox and to again add and multiply

Question

my code is using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; public partial class Admin_Default : System.Web.UI.Page { REMO sel = new REMO(); DataSet ds = new DataSet(); string s = ConfigurationManager.AppSettings[RM].ToString(); SqlConnection cn = new SqlConnection(); SqlCommand cd = new SqlCommand(); SqlDataAdapter da = new SqlDataAdapter(); public int se; public float sl; protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { prr(); sno(); pqice(); txtdate.Text = System.DateTime.Now.ToShortDateString(); } } private void sno() { // int z = 0; //ListItem cb = new ListItem(); // ds = sel.GETDS(select Billno from numbeer); ds = sel.GETDS(select min (Billno) as Billno from numbeer where status='view'); foreach (DataRow dr in ds.Tables[0].Rows) { //ListItem sw = new ListItem(); txtbillno.Text = dr[Billno].ToString(); //sw.Value = Convert.ToString(z + 1); } } private void pqice() { ListItem lik = new ListItem(); // lik.Text = Select; DropDownList3.Items.Insert(0 new ListItem(--Select-- 0)); lik.Value = 0; for (int se = 1; se { DropDownList3.Items.Add(Convert.ToString(se)); } } private void prr() { int s = 0; ListItem lim = new ListItem(); //lim.Text = Select; //lim.Value = 0; DropDownList1.Items.Add(lim.ToString()); ds = sel.GETDS(select DISTINCT name from demo); DropDownList1.Items.Insert(0 new ListItem(--Select-- 0)); foreach (DataRow dr in ds.Tables[0].Rows) { ListItem ss = new ListItem(); lim.Text = dr[name].ToString(); lim.Value = Convert.ToString(s + 1); DropDownList1.Items.Add(lim.ToString()); } } protected void DropDownList1_SelectedIndexChanged(object sender EventArgs e) { DropDownList2.Items.Clear(); DataSet ds = new DataSet(); string qr = select weight from demo where name=' + DropDownList1.SelectedValue.ToString() + '; ds = sel.GETDS(qr); ListItem se = new ListItem(); //se.Value = 0; //se.Text = Select; DropDownList2.Items.Insert(0 new ListItem(--Select-- 0)); foreach (DataRow dr in ds.Tables[0].Rows) { ListItem liz = new ListItem(); //liz.Text = Select; liz.Value = dr[weight].ToString(); DropDownList2.Items.Add(liz.ToString()); } } protected void DropDownList2_SelectedIndexChanged(object sender EventArgs e) { ListItem sss = new ListItem(); // sss.Text = Select; DropDownList2.Items.Insert(0 new ListItem(--Select-- 0)); DataSet ds = new DataSet(); string sq = select price from demo where weight=' + DropDownList2.SelectedItem.ToString() + '; ds = sel.GETDS(sq); TextBox1.Text = ds.Tables[0].Rows[0][price].ToString(); foreach (DataRow dr in ds.Tables[0].Rows) { TextBox1.Text = dr[price].ToString(); } } protected void Button1_Click(object sender EventArgs e) { //string qrt = insert into cement (DateBillNoCustomerNameAddressProductNameQuantityPriceExtra) values (' + txtdate.Text; //qrt += '' + txtbillno.Text; //qrt += '' + txtcn.Text; //qrt += '' + txtad.Text; //qrt += '' + DropDownList1.SelectedItem.ToString(); //qrt += '' + DropDownList2.SelectedItem.ToString(); //qrt += '' + TextBox1.Text; //// qrt += '' + ddprice.SelectedItem.ToString(); //qrt += '' + txtex.Text; //qrt += '); //sel.Insert(qrt); //Label10.Visible = true; //Label10.Text = Sucess; //cn = new SqlConnection(s); //cn.Open(); //string qrs = insert into product (dateProductBillNoProductNameQuantityPriceExtra) values (' + txtdate.Text; //qrs += '' + TextBox2.Text; //qrs += '' + txtbillno.Text; ////sqrs += '' + txtcn.Text; //qrs += '' + DropDownList1.SelectedItem.ToString(); //qrs += '' + DropDownList2.SelectedItem.ToString(); //qrs += '' + TextBox1.Text; ////qrs += '' + ddprice.SelectedItem.ToString(); //qrs += '' + txtex.Text; //qrs += '); ////sel.Insert(qrs); //cd = new SqlCommand(qrs cn); //cd.ExecuteNonQuery(); //cn.Close(); string up = update numbeer set status='Viewed' where Billno=' + txtbillno.Text + '; sel.Insert(up); } protected void Button2_Click(object sender EventArgs e) { txtbillno.Text = ; txtcn.Text = ; txtad.Text = ; DropDownList1.SelectedValue = Select; //DropDownList2.SelectedValue = Select; TextBox1.Text = ; txtex.Text = ; } protected void DropDownList3_SelectedIndexChanged(object sender EventArgs e) { //txttp.Text =sum:+(Convert.ToInt32(DropDownList3.SelectedValue) + Convert.ToInt32(TextBox1.Text)); float sl =(Convert.ToInt32(DropDownList3.Text)* Convert.ToInt32(TextBox1.Text)); txttp.Text = Convert.ToString(sl); TextBox6.Text = (int.Parse(txttp.Text) * (14.5 / 100)).ToString(); } protected void txtvat_TextChanged(object sender EventArgs e) { float amm=(float.Parse(txttp.Text)+float.Parse(txtvat.Text)); TextBox3.Text = Convert.ToString(amm); double guna = int.Parse(TextBox3.Text) * (14.5 / 100); TextBox4.Text = Convert.ToString(guna); TextBox5.Text = (amm + guna).ToString(); // TextBox7.Text = (sl + TextBox6.Text); float amman = (sl+ float.Parse(TextBox6.Text)); TextBox7.Text = Convert.ToString(amman); } protected void TextBox4_TextChanged(object sender EventArgs e) { float sgs = int.Parse(TextBox3.Text) + int.Parse(TextBox4.Text); TextBox5.Text = Convert.ToString(sgs); } } my design is border-width: thin; background-color: #D7D7D7; width:50% > BILLING DETAILS > onselectedindexchanged=DropDownList1_SelectedIndexChanged Width=146px>   onselectedindexchanged=DropDownList2_SelectedIndexChanged Height=16px Width=146px> Select --%> onselectedindexchanged=DropDownList3_SelectedIndexChanged Width=149px onhange=return GetTotal() > ontextchanged=txttp_TextChanged > Actual price AutoPostBack=true Text=(14.5/100) ReadOnly=True > ontextchanged=TextBox4_TextChanged Visible=False>

Jaganathan Bantheswaran · Answer

Hi Selvi Question is not clear. Please mention where you have problem.