Unable to bind LINQ to gridview

I just using a simple LINQ query having group by clause and trying to bind its result set to GridView. My LINQ query looks like

var expData = from c in WebDB.TransTable
              group c by c.enterdate into g
              select g;

Grid view on ASP.NET page

<asp:GridView ID="GridVi开发者_JAVA技巧ew1" AutoGenerateColumns="true" runat="server" DataKeyField="Key" />

But getting the error:

A field or property with the name 'Key' was not found on the selected data source.

Anyone can help me please?

None of the answers were helpful

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expData is a string as you've put the LINQ query inside quotation marks.

var expData = "from c in WebDB.TransTable
            group c by c.enterdate into g
              select g;"

System.String does not have a property called Key, hence the error.

If you remove the quotation marks it should all work fine.

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EDIT This ignores the "" in your linq statement

Look at the attribute on your asp.net GridView(aspx code): DataKeyField="" is pointing to a column name that does not exist in your linq query

<asp:GridView AutoGenerateColumns="true" DataKeyField="Key"/>

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I had your problem either , I wrote like this . I hope this work for you :

var expData = from c in WebDB.TransTable
              group c by c.enterdate into g
              select new {EnterDate = g.Key};