just want to show my ArrayList's data(a set of Array) like a table in the GridView control in asp.net using c#

I use these code below:
GridView1.DataSource = ArrListName
GridView1.DataBind()
This can show my data.However,the GridView control show all of the ArrayList's data in one column named Item,which make the page long and ugly.
I just want to show my ArrayList's data(a set of Array) like a table in the GridView control .
Can someone help me to solve this problem?
Thanks a lot !

mycaert.cs

if (Session["MyCartItems"] != null) {

// int ProductId = Convert.ToInt32(Request.QueryString.Get("ProductIdLabel"));

// ArrayList cart1 = new ArrayList();

// cart1 = (ArrayList)Session["MyCartItems"];

// Session["MyCartItems"] = cart1;

// GridView1.DataSource = cart1;

// GridView1.DataBind();

//}

mycart.aspx

BorderColor="#660033" BorderStyle="None" BorderWidth="1px" CellPadding="3"

CellSpacing="2" Width="439px"

ShowFooter="True"

ForeColor="White" >

<%--

HeaderText="Unit Price" ReadOnly="True" />

HeaderText="Total Price" />--%>

<%--

--%>

<%----%>

ConnectionString="<%$ ConnectionStrings:ShoppingDBConnectionString %>"

SelectCommand="SELECT [ProductId],[ProductName],[UnitPrice],[Discription] FROM [Product] WHERE ([ProductId]=@ProductId)">

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please help me