Gridview edit textbox gönderme sorunu

Yukarıdaki textboxtan alınan verileri aşağıdaki textboxa aktaracağım. Şimdiden teşekkürler
[CODE lang="aspnet" title="default.aspx"] <form id="form1" runat="server">
<div>
<table style="width: 100%;">
<tr>
<td class="style1">
<strong>Edit Update Delete Operation in Gridview</strong></td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px"
CellPadding="3" DataKeyNames="id" AutoGenerateDeleteButton="True"
AutoGenerateEditButton="True" OnRowCancelingEdit="GridView1_RowCancelingEdit"
OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing"
OnRowUpdating="GridView1_RowUpdating" CellSpacing="2">
<Columns>
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<asp:Label ID="LabelID" Text='<%# Bind("id") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>



<asp:TemplateField HeaderText="Name">
<EditItemTemplate>
<asp:TextBox ID="editBoxName" ReadOnly="true" runat="server" Text='<%# Bind("name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>


<asp:TemplateField HeaderText="City">
<EditItemTemplate>
<asp:TextBox ID="editBoxCity" ReadOnly="true" runat="server" Text='<%# Bind("city") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("city") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>



<asp:TemplateField HeaderText="Miktar" Visible="false">
<EditItemTemplate>
<asp:TextBox ID="editBoxMik" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Fiyat" Visible="false">
<EditItemTemplate>
<asp:TextBox ID="editBoxFiy" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Tutar" Visible="false">
<EditItemTemplate>
<asp:TextBox ID="editBoxTut" ReadOnly="true" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>


</Columns>
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
<RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
<SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FFF1D4" />
<SortedAscendingHeaderStyle BackColor="#B95C30" />
<SortedDescendingCellStyle BackColor="#F1E5CE" />
<SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>
</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</table>
<div>
<asp:Label ID="sipID" runat="server" Text="ıd">
</asp:Label><asp:TextBox ReadOnly="true" ID="txtsipID" runat="server"></asp:TextBox>
<br />
<asp:Label ID="sipName" runat="server" Text="ad">
</asp:Label><asp:TextBox ReadOnly="true" ID="txtsipName" runat="server"></asp:TextBox>
<br />

<asp:Label ID="sipAdet" runat="server" Text="adet">
</asp:Label><asp:TextBox ReadOnly="true" ID="txtsipAdet" runat="server"></asp:TextBox>
<br />

<asp:Label ID="sipFiyat" runat="server" Text="fıyat">
</asp:Label><asp:TextBox ReadOnly="true" ID="txtsipFiyat" runat="server"></asp:TextBox>
<br />

<asp:Label ID="sipTutar" runat="server" Text="tutar">
</asp:Label><asp:TextBox ReadOnly="true" ID="txtsipTutar" runat="server"></asp:TextBox>
</div>
</div>
</form>[/CODE]


[CODE lang="csharp" title="default.aspx.cs"] protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
refreshdata();
}
}

public void refreshdata()
{
SqlConnection con = new SqlConnection("Data Source=BERKAY;Initial Catalog=database;Integrated Security=True;");
SqlCommand cmd = new SqlCommand("select * from tbl_data", con);
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
sda.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();


}

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=BERKAY;Initial Catalog=database;Integrated Security=True;");
int id = Convert.ToInt16(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());
con.Open();
SqlCommand cmd = new SqlCommand("delete from tbl_data where id =@id", con);
cmd.Parameters.AddWithValue("id", id);
int i = cmd.ExecuteNonQuery();
con.Close();
refreshdata();
}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
GridView1.Columns[2].Visible = true;
GridView1.Columns[3].Visible = true;
GridView1.Columns[4].Visible = true;
GridView1.Columns[5].Visible = true;
refreshdata();

}

protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
refreshdata();
}


protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
Label txtid = GridView1.Rows[e.RowIndex].FindControl("LabelID") as Label;
txtsipID.Text = txtid.Text;

TextBox txtname = GridView1.Rows[e.RowIndex].FindControl("editBoxName") as TextBox;
txtsipName.Text = txtname.Text;


//ÇALIŞMAYAN KISIM
TextBox txtmik = GridView1.Rows[e.RowIndex].FindControl("editBoxMik") as TextBox;
txtsipAdet.Text = txtmik.Text;

TextBox txtfiyat = GridView1.Rows[e.RowIndex].FindControl("editBoxFiy") as TextBox;
txtsipFiyat.Text = txtfiyat.Text;

TextBox txttutar = GridView1.Rows[e.RowIndex].FindControl("editBoxTut") as TextBox;
txtsipTutar.Text = txttutar.Text;



}[/CODE]