1. Meeting her, I will be very glad.

2. If I meet her, I will be very glad.
3. When I meet her, I will be very glad.
4. As I meet her, I will be very glad.
5. Because I meet her, I will be very glad.
6. Because I will meet her, I will be very glad.
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What does #1 mean among the 5 sentences?

2 and 3 are the best. All the others are either very awkward or have incorrect verb tense sequencing.