Simple Registration Web form in asp.net 3.5

ok .thanks for suggestion ...i will upload improved application soon..

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Use parameterized queries (SqlCommand with SqlParameter) and put user input into parameters. Don't build SQL strings out of unchecked user input. Don't assume you can build a sanitizing routine that can check user input for every kind of malformedness. Edge cases are easily forgotten. Checking numeric input may be simple enough to get you on the safe side, but for string input just use parameters. Check for second-level vulnerabilites - don't build SQL query strings out of SQL table values if these values consist of user input. Use stored procedures to encapsulate database operations.

Bhasker, you need to make sure to write details about your code. What it does and how.