MUltiselect gridview with mouse click

I am developing one custom control in asp.net where I have one gridview with multiple rows.

1.I want user should able to sel开发者_开发技巧ect multiple rows by just clicking on the row. So user should able to select multiple rows by just clicking on row.

2.As I am using same control more places. So at some places ser should able to select only one row and at some places user should able to select multiple rows.