how i write this query in linq

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LINQ

i have query like to display record to grid view for this purpose i have this sql query like

SELECT  tbl_Post_History.Title, CAST (tbl_User_master.First_name+' '+tbl_User_master.Last_name AS VARCHAR(50)) AS [Publisher], tbl_Post_History.Created_datetime, tbl_History_Files.File_name,
        tbl_History_Files.File_ext, tbl_History_Files.File_Size, tbl_Post_History.Category_id
FROM    tbl_History_Files INNER JOIN
        tbl_Post_History ON tbl_History_Files.Post_History_id = tbl_Post_History.Id INNER JOIN
        tbl_User_master ON tbl_Post_History.User_id = tbl_User_master.Id AND tbl_Post_History.ToUser_id = tbl_User_master.Id
WHERE(tbl_Post_History.User_id = '1' OR tbl_Post_History.ToUser_id = '1')

how i write this query in linq using this cast function that i include this query.

please help me..