Question : IQueryable on datatable

Experts,
I have to build dynamic linq query in C# and need immediate help with code.
This is the datatable and I have to add where clauses dynamically to it. Please help:
DataTable results = (from d in ((DataSet)_MyDataset).Tables["Records"].AsEnumerable()
orderby d.Field("Name") ascending
where (d.Field(columnName) != null)
where d[columnName].ToString().ToLower().Contains(searchstr.ToLower())
select d).CopyToDataTable();

Answer : IQueryable on datatable

Finally I was able to add dynamic where condition and this code is working. attaching Method. thx.

                       
         
           
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             public ListItemCollection searchProject(ListItemCollection projList)
    {
        DataSet DSToReturn = new DataSet();       
        ListItemCollection returnItems = new ListItemCollection();
        ListItemCollection ResultItems = new ListItemCollection();
        DataTable results = (from d in ((DataSet)_MyDataset).Tables["Records"].AsEnumerable()
                             orderby d.Field("Name") ascending
                             select d).CopyToDataTable();
        foreach (DataRow row in results.Rows)
        {
            ListItem item = new ListItem(row["Name"].ToString(), row["Value"].ToString());
            ResultItems.Add(item);
        }
        
     
       
        
        if (this.myItems[0] != "--")
        {
 
            var query = (from q in results.AsEnumerable()
                         where q["Business"].ToString().Contains(this.myItems[0])
                         select q);
            if (query.Count() > 0)
                results = query.CopyToDataTable();
            else
                results.Rows.Clear();
 
            
            
        }
        if (this.myItems[1] != "--")
        {
 
            var query = (from q in results.AsEnumerable()
                         where q["Business_group"].ToString().Contains(this.myItems[1])
                         select q);
            if (query.Count() > 0)
                results = query.CopyToDataTable();
            else
                results.Rows.Clear();
 
        }
        if (this.myItems[2] != "--")
        {
 
            var query = (from q in results.AsEnumerable()
                         where q["Value_center"].ToString().Contains(this.myItems[2])
                         select q);
            if (query.Count() > 0)
                results = query.CopyToDataTable();
            else
                results.Rows.Clear();
 
        }
        if (this.myItems[3] != "--")
        {
 
           
            var query = (from q in results.AsEnumerable()
                         where q["Client_name"].ToString().Contains(this.myItems[3])
                         select q);
            if (query.Count() > 0)
                results = query.CopyToDataTable();
            else
                results.Rows.Clear();
 
        }
        if (this.myItems[4] != "--")
        {
 
            var query = (from q in results.AsEnumerable()
                         where q["Owner_name"].ToString().Contains(this.myItems[4])
                         select q);
            if (query.Count() > 0)
                results = query.CopyToDataTable();
            else
                results.Rows.Clear();           
            
 
        }
       
        if (results.Rows.Count > 0)
        {
            foreach (ListItem li in ResultItems)
            {
                if ((from System.Data.DataRow row in results.Rows
                     where li.Value.Equals(row["value"].ToString(), StringComparison.InvariantCultureIgnoreCase)
                     select row["value"]).Count() > 0)
                    returnItems.Add(li);
            }
        }
        else
        {
            ListItem item = new ListItem("No Results", "0");
            returnItems.Add(item);
        }
 
        return returnItems;      
       
        
    }
 
           
         

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