Sunday, May 16, 2010

How to read hidden field data in GridView Asp.net C#




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In some cases developers need to collect more data instead of datakeynames. In that cases developers use hidden field to retain those important data. Here in this article i wil show how one can use hidden field to store some important data & how can read those. For simplicity here i use a product table & use ID in a hidden field to read them from server side SelectedIndexChanged event. The product table looks like below:

Product

Now add a page in your project & also add a GridView like below:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridView_Hidden.aspx.cs" Inherits="GridView_Hidden" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>How to read GridView Hiden Field Data</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
         <HeaderStyle BackColor="Red" Font-Bold="True" ForeColor="White" />
         <RowStyle BackColor="LightGray" />
         <AlternatingRowStyle BackColor="LightGray" />

         <Columns>
             <asp:CommandField ShowSelectButton="True" />

             <asp:TemplateField HeaderText="Product Name">
             <ItemTemplate>
             <asp:HiddenField runat="server" ID="HiddenField1" Value='<%#Eval("ID")%>'></asp:HiddenField>
             <asp:Label runat="server" ID="Label2" Text ='<%#Eval("Name")%>'></asp:Label>
             </ItemTemplate>
             </asp:TemplateField>

             <asp:BoundField DataField="Description" HeaderText="Description" />
             <asp:BoundField DataField="Color" HeaderText="Color" />
             <asp:BoundField DataField="Size" HeaderText="Size" />


         </Columns>
            <SelectedRowStyle BackColor="Blue" ForeColor="White" />
        </asp:GridView>
    
    </div>
    </form>
</body>
</html>
Now under SelectedIndexChanged event write the below code to read hidden field value within gridview template column:
protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = clsDBUtility.GetDataTable("SELECT * FROM PRODUCT");
            GridView1.DataSource = dt;
            GridView1.DataBind();
            Cache["Data"] = dt;
        }

    }
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string sValue = ((HiddenField)GridView1.SelectedRow.Cells[1].FindControl("HiddenField1")).Value;
        Response.Write("Product Id=" + sValue);
    }
Now run the project & will get below like output:

Output

Hope now you can read & use the hidden field vlaue from within a GridView.

2 comments:

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Adity said...

I have a gridview in which I am setting certain rows to invisible. Now in javascript while computing the total of all values in last column in javascript, i want to access the invisible rows as well. How do I do that.

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