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    copied!<p>After a week of searching of solution I found this <a href="http://blogs.msdn.com/b/alexj/archive/2009/03/26/tip-8-writing-where-in-style-queries-using-linq-to-entities.aspx" rel="nofollow">post</a>. This work great with indexed DB with more than billion rows. Here is my code solution:</p> <pre><code>public static IQueryable&lt;LogViewer.EF.InternetEF.Log&gt; ExecuteInternetGetLogsQuery(FilterCriteria p_Criteria, ref GridView p_Datagrid) { IQueryable&lt;LogViewer.EF.InternetEF.Log&gt; internetQuery = null; List&lt;LogViewer.EF.InternetEF.Log&gt; executedList = null; using (InternetDBConnectionString context = new InternetDBConnectionString()) { internetQuery = context.Logs; if ((p_Criteria.DateTo != null &amp;&amp; p_Criteria.DateFrom != null)) { internetQuery = internetQuery.Where(c =&gt; c.Timestamp &gt;= p_Criteria.DateFrom.Value &amp;&amp; c.Timestamp &lt; p_Criteria.DateTo.Value); } else if (p_Criteria.DateFrom != null &amp;&amp; p_Criteria.DateFrom &gt; DateTime.MinValue) { internetQuery = internetQuery.Where(c =&gt; c.Timestamp &gt;= p_Criteria.DateFrom); } else if (p_Criteria.DateTo != null &amp;&amp; p_Criteria.DateTo &gt; DateTime.MinValue) { internetQuery = internetQuery.Where(c =&gt; c.Timestamp &lt; p_Criteria.DateTo); } if (!string.IsNullOrEmpty(p_Criteria.FreeText)) { internetQuery = internetQuery.Where(c =&gt; c.FormattedMessage.Contains(p_Criteria.FreeText)); } if (p_Criteria.Titles.Count &gt; 0) { internetQuery = internetQuery.Where(BuildOrExpression&lt;LogViewer.EF.InternetEF.Log, string&gt;(p =&gt; p.Title, p_Criteria.Titles)); } if (p_Criteria.MachineNames.Count &gt; 0) { internetQuery = internetQuery.Where(BuildOrExpression&lt;LogViewer.EF.InternetEF.Log, string&gt;(p =&gt; p.MachineName, p_Criteria.MachineNames)); } if (p_Criteria.Severities.Count &gt; 0) { internetQuery = internetQuery.Where(BuildOrExpression&lt;LogViewer.EF.InternetEF.Log, string&gt;(p =&gt; p.Severity, p_Criteria.Severities)); } internetQuery = internetQuery.Take(p_Criteria.TopValue); executedList = internetQuery.ToList&lt;LogViewer.EF.InternetEF.Log&gt;(); executedList = executedList.OrderByDescending(c =&gt; c.LogID).ToList&lt;LogViewer.EF.InternetEF.Log&gt;(); ; p_Datagrid.DataSource = executedList; p_Datagrid.DataBind(); return internetQuery; } } public static Expression&lt;Func&lt;TElement, bool&gt;&gt; BuildOrExpression&lt;TElement, TValue&gt;( Expression&lt;Func&lt;TElement, TValue&gt;&gt; valueSelector, IEnumerable&lt;TValue&gt; values ) { if (null == valueSelector) throw new ArgumentNullException("valueSelector"); if (null == values) throw new ArgumentNullException("values"); ParameterExpression p = valueSelector.Parameters.Single(); if (!values.Any()) return e =&gt; false; var equals = values.Select(value =&gt; (Expression)Expression.Equal( valueSelector.Body, Expression.Constant( value, typeof(TValue) ) ) ); var body = equals.Aggregate&lt;Expression&gt;( (accumulate, equal) =&gt; Expression.Or(accumulate, equal) ); return Expression.Lambda&lt;Func&lt;TElement, bool&gt;&gt;(body, p); } </code></pre> <p>I hope this will usefull for our community Thanks</p>
 

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