If you try to add same key to a hashtable you may encounter this error
var ht = new Hashtable();
ht.Add("key", "Data1");
.
.
.
ht.Add("key", "Data2");
To avoid this use you can simply change this code like
var ht = new Hashtable();
ht["key"] = "Data1";
.
.
.
ht["key"] = "Data2";
This index will add the key, if it is not in the hashtable, else will just update the value
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