Gridview with Table.Rows.Count ==0 to show Footer row that include checkbox with imageurl cast

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As my question indicate, I need to show footer in empty gridview but when I put a checkbox and use imageurl with cast to get imageurl from code behind, it raise error, may anyone help me?
Here is my code:

<asp:TemplateField FooterStyle-CssClass="Clm100" HeaderStyle-CssClass="Clm100" HeaderText="<%$ Resources:Pages, CanPrint %>" SortExpression="CanPrint">
<itemtemplate>
<asp:Image ImageUrl=<%# GetCheckMark((bool)Eval("CanPrint")) %>  ID="ImgCanPrint" runat="server" />
</itemtemplate>
<edititemtemplate>
<asp:CheckBox ID="EdtCanPrint" runat="Server" Checked='<%# Eval("CanPrint") %>'>
</edititemtemplate>
<footertemplate>
<asp:CheckBox CssClass="Clm100" ID="FooterCanPrint" runat="server" />
</footertemplate>

and cast

protected string GetCheckMark(bool checkd)
{ 
    return checkd ? "../../../../../ServerFile/Icons/Editor/True.png" : "../../../../../ServerFile/Icons/Editor/False.png";
}

and cast

Posted 20-Apr-12 20:22pm

A.Ebrahimi

Updated 20-Apr-12 20:26pm

Abhinav S

v2

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Comments

Sandeep Mewara 21-Apr-12 3:16am

Not clear on what you want. Please re-phrase and also add the error that you are getting.

A.Ebrahimi 21-Apr-12 3:41am

This is error:
Exception Details: System.InvalidCastException: Specified cast is not valid.
More information: since the field in grid in null, the cast face error and since the eval("CanPrint") is boolean I don't know how to avoid it.
It seems that I must check null value before using cast, but I don't know how?
Thanks

A.Ebrahimi 21-Apr-12 3:55am

Hi again:
As I check, only whet table is empty it raise error with cast. I changed my cast but I have problem:
Convert.ToBoolean(Eval("CanSee"))?"~/ServerFile/Icons/Editor/True.png":"~/ServerFile/Icons/Editor/False.png"
Error:
Object cannot be cast from DBNull to other types.

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A.Ebrahimi · Accepted Answer · 2012-04-20T23:02:00

Solution 1

As I have found the main cause of this error is when table is empty then there is no value to pass to eval and it raise error. So change my question.

Posted 20-Apr-12 23:02pm

A.Ebrahimi