i gave a textbox and button in list view but it doesnt wotk.. solved

this my design


<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1"

>
<alternatingitemtemplate><br>
<div class="name">
<span>
<asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' CssClass="fixd" />
<br />
<br />
<asp:Label ID="messageLabel" runat="server" Text='<%# Eval("message") %>' />
<br />

<br />


<br />

<asp:Label ID="task_statusLabel" runat="server"
Text='<%# Eval("task_status") %>' />


<br />
Posted by :
<asp:Label ID="asigntask_nameLabel" runat="server"
Text='<%# Eval("asigntask_name") %>' CssClass="fixd" />



<span class="asgndate">date
<asp:Label ID="curnt_dateLabel" runat="server"
Text='<%# Eval("curnt_date") %>' /></span>

<div class="cust_summary">Replay</div>

<div id="cust_details" class="cust_details" style="display:none; ">Hello Replay here !
<br />

<asp:TextBox ID="TextBoxL" placeholder="Write Your Comment.." class="blog" runat="server" TextMode="MultiLine" Rows="2"><br /> <br />
<asp:Button ID="Button3" runat="server" Text="Post" onclick="Button3_Click" /> </div> <br />

</span></div>



<edititemtemplate>
<div class="name">
<span style="">

<asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' CssClass="name fixd" />
<br />
<asp:TextBox ID="messageTextBox" runat="server" Text='<%# Bind("message") %>' />
<br />
<br />

<br />
<asp:TextBox ID="task_statusTextBox" runat="server"
Text='<%# Bind("task_status") %>' />
<br /><br />
<span class="msgcolor"> Posted by</span>
<asp:TextBox ID="asigntask_nameTextBox" runat="server"
Text='<%# Bind("asigntask_name") %>' />



<asp:TextBox ID="curnt_dateTextBox" runat="server"
Text='<%# Bind("curnt_date") %>' />
<br />

<asp:Button ID="UpdateButton" runat="server" CommandName="Update"
Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Cancel" />
<br />
<br />
</span></div>

<emptydatatemplate>


<span>No data was returned.</span>

<insertitemtemplate><br>
<div class="name">
<span style="" class="name">

<asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' CssClass="name fixd" />
<br />
<asp:TextBox ID="messageTextBox" runat="server" Text='<%# Bind("message") %>' />
<br />
<br />

<br />
<asp:TextBox ID="task_statusTextBox" runat="server"
Text='<%# Bind("task_status") %>' />
<br />



<br />
<span class="msgcolor"> Posted by</span>
<asp:TextBox ID="asigntask_nameTextBox" runat="server"
Text='<%# Bind("asigntask_name") %>' />

<asp:TextBox ID="

this is a back code
protected void Button3_Click(object sender, EventArgs e)
{
try
{
SqlConnection c = new SqlConnection(ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString);

SqlCommand cmd = new SqlCommand();

cmd.Connection = c; //assigning connection to command
cmd.CommandType = CommandType.Text; //representing type of command

cmd.CommandText ="update task set post=@post where asigntask_name=@asigntask_name";


cmd.Parameters.AddWithValue("@post", TextBoxL.text);
cmd.Parameters.AddWithValue("@asigntask_name", s2);
c.Open();
cmd.ExecuteNonQuery();
c.Close();
TextBoxL.Text = "";
this.Response.Redirect("cnnn.aspx");
}
catch (System.Data.SqlClient.SqlException ex)
{
Label1.Text = ex.Message.ToString();
}
}