Why ImageButton Display Text SubmitQuery Runtime - asp.net

Question

i use imagebutton in datalist and set codeexpression :Eval("PictureUrl", "ProductImages\thumb_{0}") and runtime display submitquery.
<asp:DataList ID="DataList1" runat="server" DataKeyField="pid"
DataSourceID="SqlDataSource1">
<ItemTemplate>
pname:
<asp:Label ID="pnameLabel" runat="server" Text='<%# Eval("pname") %>' />
<br />
pprice:
<asp:Label ID="ppriceLabel" runat="server" Text='<%# Eval("pprice") %>' />
<br />
publisher:
<asp:Label ID="publisherLabel" runat="server" Text='<%# Eval("publisher") %>' />
<br />
writer:
<asp:Label ID="writerLabel" runat="server" Text='<%# Eval("writer") %>' />
<br />
<asp:ImageButton ID="ImageButton7" runat="server"
ImageUrl='<%# Eval("PictureUrl", "ProductImages\thumb_{0}") %>' />
<br />
</ItemTemplate>
</asp:DataList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:dbpath %>"
SelectCommand="SELECT [pname], [pprice], [PictureUrl], [gid], [storeid], [publisher], [writer], [pid] FROM [tblproduct]">
</asp:SqlDataSource>
output one record:
pname:
<span id="ContentPlaceHolder1_DataList1_pnameLabel_0">تکنیک عکاسی</span>
<br />
pprice:
<span id="ContentPlaceHolder1_DataList1_ppriceLabel_0">125000 </span>
<br />
publisher:
<span id="ContentPlaceHolder1_DataList1_publisherLabel_0">اسرار دانش</span>
<br />
writer:
<span id="ContentPlaceHolder1_DataList1_writerLabel_0">نصرالله کسرائیان</span>
<br />
<input type="image" name="ctl00$ContentPlaceHolder1$DataList1$ctl00$ImageButton7" id="ContentPlaceHolder1_DataList1_ImageButton7_0" src="ProductImages%09humb_~/image/tecnikakasi.jpg" />

Answer 1

You got the correct HTML rendered
<asp:ImageButton ID="ImageButton7" runat="server"
ImageUrl='<%# Eval("PictureUrl", "ProductImages\thumb_{0}") %>' />
will produce input tag with type=image
<input type="image" name="ctl00$ContentPlaceHolder1$DataList1$ctl00$ImageButton7" id="ContentPlaceHolder1_DataList1_ImageButton7_0" src="ProductImages%09humb_~/image/tecnikakasi.jpg" />
The problem is ProductImages%09humb_~/image/tecnikakasi.jpg not exists. It may be wrong.
Check the relative path rendered.
Try
ImageUrl='<%# Eval("PictureUrl", "~/ProductImages/thumb_{0}") %>'

Answer 2

It is displaying "SubmitQuery" because your image is not being loaded. If your writer alternate text, then alternate text will be displayed.
You can view source of the generated html and check the path of the image and try to correct it for resolving this problem.
ImageUrl='<%# Eval("PictureUrl", "{0}") %>'