Questions About dataGridView

Question

A- How can I paste from clipboard to datagridview
B- How can I copy selected row to clipboard
C- How can I remove rows which not starts with specific string (for example; "http://")

I had 10 problems like that, I figured out 7 of them.
I did much research about these 3 issues, but I can't find any useful information.
Finally I realized that; dataGridView is the most hard to use control in C# visual studio.

Thanks.