copy string array elements to strings in C#

I have the following code;
string test1 = words[2];//"Exclud"
string test2 ="Exclud";
string test3 = String.Copy(words[2]);//"Exclud"

bool booTest1 = test1.Equals(test2);//false
bool booTest2 = test2.Equals("Exclud");//true
bool booTest3 = test1.Equals("Exclud");//false
bool booTest4 = words[0].Equals("Exclud");//false
bool booTest5 = test3.Equals("Exclud");//false
bool booTest6 = test1.Equals(test1); //true

Though test1 = "Exclud" which is copied from string arrray words[],
when compared it shows that test1 != "Exclud"

Can some one please help me with this?

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