C# .NET Performace tips

1. use value type instead of reference type wherever possible.

2. use struct to pass data around (through the web) instead of passing object.

3. use boxing/unboxing only if they are the only option you have got.

4. try not to determind data type at runtime, use generic whenever possible.

5. use dictionary instead of hashtable.

6. batch query in one transaction if possible.

7. use dataReader instead of dataSet, etc.

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