var dict3 = Dict.Where(entry => Dict_BM[entry.Key] != entry.Value)
                .ToDictionary(entry => entry.Key, entry => entry.Value);

var dict3 = Dict.ToDictionary(
    entry => entry.Key,
    entry => Dict_BM[entry.Key] == entry.Value);

var dict3 = Dict.Keys.Union(Dict_BM.Keys).ToDictionary(
    key => key,
    key => Dict.ContainsKey(key) &&
           Dict_BM.ContainsKey(key) &&
           Dict[key] == Dict_BM[key]);

var areEqual = Dict.SequenceEqual(Dict_BM);

Dictionary<string, int> Dictionary1 = new Dictionary<string, int>();
                d1.Add("data1",10);
                d1.Add("data2",11);
                d1.Add("data3",12);
                Dictionary<string, int> Dictionary2 = new Dictionary<string, int>();
                d2.Add("data3", 12);
                d2.Add("data1",10);
                d2.Add("data2",11);
                bool equal = false;
                if (Dictionary1.Count == Dictionary2.Count) // Require equal count.
                {
                    equal = true;
                    foreach (var pair in Dictionary1)
                    {
                        int tempValue;
                        if (Dictionary2.TryGetValue(pair.Key, out tempValue))
                        {
                            // Require value be equal.
                            if (tempValue != pair.Value)
                            {
                                equal = false;
                                break;
                            }
                        }
                        else
                        {
                            // Require key be present.
                            equal = false;
                            break;
                        }
                    }
                }
                if (equal == true)
                {
                    Console.WriteLine("Content Matched");
                }
                else
                {
                    Console.WriteLine("Content Doesn't Matched");
                }