concdtional img src inside grdiview image template - image

Question

I m using image template inside a gridview like this
<asp:TemplateField ItemStyle-Width="20px">
<ItemTemplate>
<a href="JavaScript:divexpandcollapse('div1<%# Eval("bank_id") %>');">
<img alt="" id="imgdiv1<%# Eval("bank_id") %>" width="20px" border="0" src="../Images/Plus.gif" />
</a>
</ItemTemplate>
</asp:TemplateField>
here i am using src="../Images/Plus.gif" but i want to set to path conditionaly.like if Eval("bank_id") is -1 then there should no image displayed or path to b set.is there any one help me to set the conditonal image path

Answer 1

you can small trick here. instead of bind your data directly to your image you could call some function that 'll send to it directly the data from DB then in that function you check for that value and based on what you need you return the correct string(correct image src).
<asp:TemplateField ItemStyle-Width="20px">
<ItemTemplate>
<a href="JavaScript:divexpandcollapse('div1<%# Eval("bank_id") %>');">
<img alt="" id='<%#getImageSRC(int.Parse(Eval("bank_id").ToString())) %>' width="20px" border="0" src="../Images/Plus.gif" />
</a>
</ItemTemplate>
</asp:TemplateField>
then in your cs file:
public string getImageSRC(int bankId)
{
if (bankId < 0)
return "";
else
return "/bank-images/" + bankId + ".jpeg";//return here the correct image path
}