C# - How To Hide A Column In The Table Based On A Boolean Variable

So I have an <asp:Gridview> and in my C# file, I am setting the datasource to some database table, and doing .DataBind().

However, I want to hide a column in the table based on a Boolean variable.

Something like this:

gridview.Columns['Field5'].Visible = false;

Or perhaps:

int c = gridview.Rows.Count();
for(int i = 0; i < c; i++){
gridview.Rows['Field5'].Remove();
}

Perhaps I cannot make it invisible, but I'm sure I can at least loop through and remove all rows related to the column "field5". I don't know how to go about doing this.

Does anyone perhaps have a proper link to using the GridView Class and how all the methods are suppose to be used because it's not clear, perhaps not written by microsoft?

the internet seems to lack a lot of C# documentation (or maybe it's just cluttered with too much useless ASP.net information).