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POmultiply the gridview columns
 

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    <p>I will post you my code and i will explain what i want to do</p> <pre><code>&lt;div&gt; &lt;div&gt; &lt;asp:GridView ID="gridView1" runat="server"&gt; &lt;Columns&gt; &lt;asp:TemplateField&gt; &lt;ItemTemplate&gt; &lt;asp:CheckBox ID="chkSelect" runat="server" /&gt; &lt;asp:HiddenField ID="hdValue" runat="server" Value='&lt;%#Eval("ID") %&gt;' /&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; &lt;/div&gt; &lt;div&gt; &lt;asp:Button ID="btnMove" runat="server" Text="Add To Cart" OnClick="btnMove_Click" /&gt; &lt;/div&gt; &lt;div&gt; &lt;asp:GridView ID="gridView2" runat="server"&gt; &lt;Columns&gt; &lt;asp:TemplateField HeaderText="Quantity"&gt; &lt;ItemTemplate&gt; &lt;asp:TextBox ID="tbQty" runat="server" Width="25px" MaxLength="3" /&gt; &lt;/ItemTemplate&gt; &lt;ItemStyle Width="25px" HorizontalAlign="Center"/&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; &lt;/div&gt; &lt;br /&gt; &lt;asp:Button ID="Button1" runat="server" Text="Find the total" /&gt; &lt;asp:Label ID="Label7" runat="server" Text="Total"&gt;&lt;/asp:Label&gt; &lt;asp:TextBox ID="TextBox1" runat="server" ontextchanged="TextBox1_TextChanged"&gt;&lt;/asp:TextBox&gt; &lt;br /&gt; &lt;br /&gt; &lt;/div&gt; </code></pre> <p>and the theo.aspx.cs</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; public partial class theo : System.Web.UI.Page { const string key = "MyDataSource5"; protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { BindGridView(); } } private void BindGridView() { if (Session[key] == null) { gridView1.DataSource = GetDataSource(); gridView1.DataBind(); } else { gridView1.DataSource = (DataTable)Session[key]; gridView1.DataBind(); } } protected DataTable GetDataSource() { try { DataTable dt = new DataTable(); dt = new DataTable(); dt.Columns.Add("ID", typeof(int)).AutoIncrement = true; dt.Columns.Add("Name", typeof(string)); dt.Columns.Add("Price(Grouch)/Hectares", typeof(float)); DataColumn[] keys = new DataColumn[2]; keys[0] = dt.Columns["ID"]; dt.PrimaryKey = keys; dt.Rows.Add("1", "Seaside Location", 1.5); dt.Rows.Add("2", "Arable Land", 0.1); dt.Rows.Add("3", "Foothills of the mountains", 1.5); dt.Rows.Add("4", "Industrial Land", 0.1); dt.Rows.Add("5", "Rolling Farmland", 0.5); Session[key] = dt; return dt; } catch { return null; } } protected void btnMove_Click(object sender, EventArgs e) { try { DataTable dtMain = Session[key] as DataTable; //copy the schema of source table DataTable dtClone = dtMain.Clone(); foreach (GridViewRow gv in gridView1.Rows) { CheckBox chk = gv.FindControl("chkSelect") as CheckBox; HiddenField hdValue = gv.FindControl("hdValue") as HiddenField; if (chk.Checked) { //get only the rows you want DataRow[] results = dtMain.Select("ID=" + hdValue.Value + ""); //populate new destination table foreach (DataRow dr in results) { dtClone.ImportRow(dr); } } gridView2.DataSource = dtClone; gridView2.DataBind(); } } catch { BindGridView(); } } } </code></pre> <p>In this code when i check for example 2 choices from gridview 1 and click the button add to cart then these 2 choices are moving to the second gridview. As you see,I have a textbox for the quantity. I would like when i give the quantity to multiply it with the price.With the button 'find the total' i want to give me the result in the text box.How can i do that?</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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