Highlighting a row does not select the row. In order for the row to be selected, it must be added to the SelectedRowCollection. This can be done using the Add method.

Add the following code to the Click event of the Select button:

To write code in Visual Basic

Me.C1TrueDBGrid1.SelectedRows.Add(Me.C1TrueDBGrid1.Bookmark)

To write code in C#

this.c1TrueDBGrid1.SelectedRows.Add(this.c1TrueDBGrid1.Bookmark);

What You've Accomplished

Using this example, the current row is selected:

See Tutorial 5: Selecting Multiple Rows Using Bookmarks for an example of the Add method being used.