مرسی که توجه می کنید
این source کدمه :
<div style=" font-family:Tahoma; font-size:12px; text-align:left; direction:rtl; color:#184262;">
<br /><br />
<asp:Panel ID="Panel_Customer" runat="server">
<table>
<tr>
<td>
نام کامل :</td>
<td align="right">
<asp:TextBox ID="txt_name" runat="server" Width="250px" MaxLength="50"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txt_name" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
تاریخ تولد :</td>
<td align="right">
<asp:TextBox ID="txt_brithday" runat="server" Width="250px" MaxLength="20"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="txt_brithday" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style2">
سن پوستی :</td>
<td align="right">
<asp:TextBox ID="txt_AgeSkin" runat="server" Width="250px" MaxLength="5"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="txt_AgeSkin" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
نوع پوست :</td>
<td align="right">
<asp:TextBox ID="txt_kindSkin" runat="server" Width="250px" MaxLength="50"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
ControlToValidate="txt_kindSkin" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
مشکل پوست :</td>
<td align="right">
<asp:TextBox ID="txt_problemSkin" runat="server" Width="250px" MaxLength="500"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="txt_problemSkin" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
شماره تماس :</td>
<td align="right">
<asp:TextBox ID="txt_tel" runat="server" Width="250px" MaxLength="20"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server"
ControlToValidate="txt_tel" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
آدرس پستی :</td>
<td align="right">
<asp:TextBox ID="txt_address" runat="server" Width="250px" MaxLength="250"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server"
ControlToValidate="txt_address" ErrorMessage="*" ValidationGroup="sav"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
</td>
<td align="right">
<br />
<asp:Button ID="btn_send" runat="server" Text="ارسال مشخصات" Font-Names="tahoma"
Font-Size="11px" ValidationGroup="sav" onclick="btn_send_Click"
BorderStyle="Dotted" BorderWidth="1px" BorderColor="#184262" Height="25px"
Width="110px" />
</td>
</tr>
</table>
</asp:Panel>
<br /><br />
<asp:Panel ID="Panel_Order" runat="server" Font-Bold="False"
Font-Names="Tahoma" Visible="False">
<br />
<table class="style15">
<tr>
<td align="left" class="style16">
محصول مورد نظر :</td>
<td align="right">
<asp:TextBox ID="txt_detail" runat="server" Width="275px" AutoPostBack="True"
ontextchanged="txt_detail_TextChanged"></asp:TextBox>
</td>
</tr>
<tr>
<td align="left" class="style16">
</td>
<td align="right">
</td>
</tr>
<tr>
<td align="center" class="style16" colspan="2">
<asp:DataList ID="datalist_product" runat="server" CellSpacing="20"
Font-Names="tahoma" Font-Size="11px" RepeatColumns="5" Width="400px"
Height="120px">
<ItemTemplate>
<div style=" width:130px; height:110px; margin-left:20px; text-align:center; direction:ltr; border: 1px dotted #184262;">
<a href='<%# Eval("AddPicProduct_large") %>' title='<%# Eval("Detail_Product") %>'><span></span>
<asp:Image ID="Image1" runat="server" ImageUrl='<%# bind("AddPicProduct_small") %>' Height="80px" Width="75px" />
</a>
<br />
<asp:Label ID="lbl_id_child" runat="server" Text='<%# bind("Id_Category_Child") %>'></asp:Label>
کد محصول <br />
</div>
</ItemTemplate>
</asp:DataList>
</td>
</tr>
<tr>
<td align="left" class="style1">
</td>
<td align="right" class="style1">
</td>
</tr>
<tr>
<td align="left" class="style1">
کد محصول را وارد نمایید :</td>
<td align="right" class="style1">
<asp:TextBox ID="txt_productCode" runat="server" MaxLength="3" Width="275px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator9" runat="server"
ControlToValidate="txt_productCode" ErrorMessage="*" ValidationGroup="sefaresh"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="left" class="style16">
تعداد سفارش :
</td>
<td align="right">
<asp:TextBox ID="txt_tedad" runat="server" Width="275px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator8" runat="server"
ControlToValidate="txt_tedad" ErrorMessage="*" ValidationGroup="sefaresh"></asp:RequiredFieldValidator>
</td>
</tr>
</table>
<br />
<asp:Button ID="btn_order" runat="server" onclick="btn_order_Click"
style="width:120px; margin-left:800px; font-family:Tahoma; font-size:11px; font-weight:bold; height:25px;"
Text="اضافه به سبد خرید" ValidationGroup="sefaresh" BorderStyle="Dotted" BorderWidth="1px" BorderColor="#184262" />
<br />
<br />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
onrowdeleting="GridView1_RowDeleting" Width="395px"
style="margin-right: 0px" Font-Names="tahoma" Font-Size="11px">
<Columns>
<asp:TemplateField HeaderText="کد محصول" Visible="False">
<ItemTemplate>
<asp:Label ID="lbl_id_product" runat="server" Text='<%# bind("Id_Product") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Text_Category_Child" HeaderText="نام برند" />
<asp:BoundField DataField="Brand_Order" HeaderText="کد محصول" />
<asp:BoundField DataField="Tedad_Product" HeaderText="تعداد" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="delete"
OnClientClick="return confirm('آیا از حذف این سفارش مطمئن هستید؟');"
ForeColor="Black">حذف از سبد خرید</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<br />
<asp:Button ID="btn_ersal" runat="server"
style="width:90px; margin-left:820px; font-family:Tahoma; font-size:11px; font-weight:bold; height:25px;"
onclick="btn_ersal_Click" Text="ارسال سفارش" BorderStyle="Dotted" BorderWidth="1px" BorderColor="#184262" />
<br />
<br />
</asp:Panel>
</div>
اینم کد C# : (موقعه اجرای این کد خطا میده)
protected void txt_detail_TextChanged(object sender, EventArgs e)
{
var QuerySearch = from pro in datacontext.Tbl_Products
from mai in datacontext.Tbl_CategoryMains
from chi in datacontext.Tbl_CategoryChilds
where chi.Id_Category_Main == mai.Id_Category_Main
&& chi.Id_Category_Child == pro.Id_Category_Child
&& pro.Id_Category_Main == mai.Id_Category_Main
&& pro.Id_Language == 1
&& chi.Id_Language == 1
&& mai.Id_Language == 1
&& (pro.Detail_Product.Contains(txt_detail.Text.Trim( )))
|| (mai.Text_Category_Main.Contains(txt_detail.Text.T rim()))
|| (chi.Text_Category_Child.Contains(txt_detail.Text. Trim()))
select new
{
pro.Detail_Product,
pro.Id_Product,
pro.Id_Language,
chi.Text_Category_Child,
chi.Id_Category_Child,
mai.Text_Category_Main,
mai.Id_Category_Main,
pro.AddPicProduct_large,
pro.AddPicProduct_small
};
datalist_product.DataSource = QuerySearch;
datalist_product.DataBind();
}