Forms Data Controls :: Gridview / Adding CheckBox In RowDataBound - CheckedChanged Event Not Fired - Page Lifecycle

I have a page on which everything is loaded dynamically.

There is a Gridview (AutoGenerateColumns=true) and in the RowDataBound I check every column for a boolean datatype. If found I add a checkbox (autopostback=true) to the cell and register the CheckedChanged event.
The problem is, that I only get the CheckedChanged event, if I reload the grid in Page_Load:

protected void Page_Load(object sender, EventArgs e) {
LoadGrid();
}

But this is very expensive and causes that the db request will be executed twice. If I changed the code to what I want:

protected void Page_Load(object sender, EventArgs e) {
if (!this.IsPostBack)
loadGrid();
}

I get no CheckedChanged event.

Is there a possibility to get:

- Adding a Checkbox in RowDataBound
- Only "LoadGrid()" if it is no PostBack
- Getting the CheckedChanged event of the relevant row