Add row from textbox to listview

Question

What should i do? It doesnt add a row even if i already declare a new row.

 

 //This is my behind codes in add button

DataTable dt = new DataTable();

DataRow dr = null;

dt.Columns.Add(new DataColumn("Column1", typeof(string)));

dt.Columns.Add(new DataColumn("Column2", typeof(string)));

dr = dt.NewRow();

dr["Column1"] = "";

dr["Column2"] = TextBox1.Text;

dt.Rows.Add(dr);

ViewState["CurrentTable"] = dt;

ListView1.DataSource = dt;

ListView1.DataBind();

 

 //This is my layout code

<asp:ListView ID="ListView1" runat="server">

<LayoutTemplate>

<div >

<table id="Table1" runat="server">

<tr id="Tr1" runat="server">

<td id="Td2" runat="server">

<table id="itemPlaceholderContainer" runat="server" border="0">

<tr id="Tr2" runat="server">

<th id="Th1" runat="server">ID</th>

<th id="Th2" runat="server">AppName</th>

</tr>

<tr runat="server" id="itemPlaceholder">

</tr>

</table>

</td>

</tr>

</table>

</div>

</LayoutTemplate>

<ItemTemplate>

<div>

<td id="Td1" runat="server"> <%#Eval("Column1") %>

</td>

<td id="Td2" runat="server"> <%#Eval("Column2") %>

</td>

</div>

</ItemTemplate>

</asp:ListView>