Select value from Listbox

Try using:

   .lstVehRegDailyRun.SelectedItem.Replace(" ", "") = Str_Car

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Thanks Gustav Brock,
But, it didn't work. Any more suggestions?
Spec: 
The item in listbox is with space.
The item in the textbox.text is without space. 

Tried this as well

  Dim index As Integer = .lstVehRegDailyRun.FindString(Str_Car)
                            ' If the item was not found in ListBox 2 display a message box, otherwise select it in ListBox2.
                            If index = -1 Then
                                ClMain.FormatMessage(21, "Please check the Car's Reg  as its not in the system. Please add the Car to the system.")
                                Exit Sub
                            Else
                                .lstVehRegDailyRun.SetSelected(index, True)
                            End If

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We only had your single code line.

If you wish to match a string with the same string including a space, either the first must have a space inserted or the space must be removed from the last; or all spaces removed from both.

how are you getting  Str_Car  ?
This does work:
ListBox1.SelectedItem = "REG 1NN"

can you show the contents of str_car before trying to use it in the selectedvalue(msgbox or debug print)

str_car   is a string.
str_car  =  "REG1NN"

And the listbox items are
REG 1NN
REG 789

So it does exist in the listbox but, by the code ListBox1.SelectedItem  it does not return true. 

Also are you sure the "space" in "REG 1NN" is actually a space (chr(32))   , or some other non printable character?

These values are coming from database.

it does not exist in the listbox, REG1NN is not the same as REG 1NN, it will never find it this way

so you can try to search only for a part of the string like
.lstVehRegDailyRun.SelectedItem = left(Str_Car,3)
it will then give youthe first ocurrence of REG ignoring the rest

Could have done that but, its Car reg so finding just 1st three will not help

Thanks Arana (G.P.) 
Trying and be right back

beware that this is not optimized for performance, if you have a lot of items in the list, this will not be fast (talking about hundreds of items)

Thanks Arana (G.P.) it worked!