what is the use of Eval() in asp.net

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While binding a databound control, you can evaluate a field of the row in your data source with eval() function.

For example you can add a column to your gridview like that : 

<asp:BoundField DataField="YourFieldName" />

And alternatively, this is the way with eval :

<asp:TemplateField>
<ItemTemplate>
        <asp:Label ID="lbl" runat="server" Text="<%# Eval("YourFieldName") %>">
        </asp:Label>
</ItemTemplate>
</asp:TemplateField>

It seems a little bit complex, but it’s flexible, because you can set any property of the control with the eval() function : 

<asp:TemplateField>
    <ItemTemplate>
        <asp:HyperLink ID="HyperLink1" runat="server" 
          NavigateUrl="<%# "ShowDetails.aspx?id="+Eval("Id") %>" 
          Text="<%# Eval("Text", "{0}") %>"></asp:HyperLink>
    </ItemTemplate>
</asp:TemplateField>

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