ToDataTable

public static DataTable ToDataTable<T>(this IEnumerable<T> varlist)
{
    DataTable dtReturn = new DataTable();

    // column names 
    PropertyInfo[] oProps = null;

    if (varlist == null) return dtReturn;

    foreach (T rec in varlist)
    {
        // Use reflection to get property names, to create table, Only first time, others will follow 
        if (oProps == null)
        {
            oProps = ((Type)rec.GetType()).GetProperties();
            foreach (PropertyInfo pi in oProps)
            {
                Type colType = pi.PropertyType;

                if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() == typeof(Nullable<>)))
                {
                    colType = colType.GetGenericArguments()[0];
                }

                dtReturn.Columns.Add(new DataColumn(pi.Name, colType));
            }
        }

        DataRow dr = dtReturn.NewRow();

        foreach (PropertyInfo pi in oProps)
        {
            dr[pi.Name] = pi.GetValue(rec, null) == null ? DBNull.Value : pi.GetValue
            (rec, null);
        }

        dtReturn.Rows.Add(dr);
    }
    return dtReturn;
}

// It will result an IQueryable (IEnumerable)
var result = from c in db.customer
             where c.id = 26
             select c;

DataTable dtResults = new DataTable();
dtResults = result.ToDataTable();