Get typed text in textbox DataItemTemplate - DevExpress.

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ASP.NET

DevExpress

This is my screen:
http://i.stack.imgur.com/LsPbX.png

I type in textbox, then I check checkbox.
Next I click button cbXacNhan to insert data into database but typed data don't update. Data update into database is old values.
I want insert typed data into data table.
I need to help.

This is my code:

protected int[] SelectedRowsIndex()
        {
            int[] indexes = new int[gridThuTien.Selection.Count];
            int k = 0;
            for (int i = 0; i < gridThuTien.VisibleRowCount; i++)
            {
                if (gridThuTien.Selection.IsRowSelected(i))
                {
                    indexes[k] = i;
                    k++;
                }
            }
            return indexes;
        }
    protected void cbXacNhan_Callback(object source, DevExpress.Web.ASPxCallback.CallbackEventArgs e)
    {
        int TienHDKHId;
        ASPxTextBox txtSoTien;
        ASPxTextBox txtHDKHId;
        int[] indexes = SelectedRowsIndex();
        foreach (int i in indexes)
        {
            txtSoTien = gridThuTien.FindRowCellTemplateControl(i, gridThuTien.Columns["TienTT"] as GridViewDataColumn, "ASPxTextBox1") as ASPxTextBox;
            txtHDKHId = gridThuTien.FindRowCellTemplateControl(i, gridThuTien.Columns["TienHDKHId"] as GridViewDataColumn, "ASPxTextBox2") as ASPxTextBox;
            decimal sotien = Convert.ToDecimal(txtSoTien.Text);
            int hdid = Convert.ToInt32(txtHDKHId.Text);
    		int loaitien = Convert.ToInt32(cbxLoaiTien.Value);
    		int nhanvienid = Convert.ToInt32(Session["NhanVienId"]);
    		clst.T_INSERT_PHIEUXACNHAN(hdid, loaitien, sotien, nhanvienid);
        }
    }

My ASPX code:

<dx:GridViewDataTextColumn Caption="Loại tiền" FieldName="TienTT" Name="LOAITIEN" Width="100px">
        <DataItemTemplate>
    		<dx:ASPxTextBox ID="ASPxTextBox1"  runat="server" Width="100%" Text='<%#Eval("TienTT")%>'>
    		</dx:ASPxTextBox>
        </DataItemTemplate>
    </dx:GridViewDataTextColumn>
    <dx:GridViewCommandColumn ShowSelectCheckbox="true" Width="50px" >
        <HeaderTemplate>
            <input type="checkbox" name="cbxSelect"  runat="server" enableviewstate="true" id="checkAll" title="Chọn/ Bỏ chọn tất cả" 
                />
        </HeaderTemplate>
        <HeaderStyle HorizontalAlign="Center" />
    </dx:GridViewCommandColumn>