checklistbox selection mode

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VB

i am using a checklistbox so a user can make multiple selection but the selection mode cant be set to multiple, i have to go through the hustles of writing codes for checkboxes which is working though but i still want to know if theres anyway i can use checklistbox to accomplish that...could anyone help me
thanks...the following is codes i tried out

Dim checker As String
    Dim check1 As String
    Dim check2 As String
    Dim check3 As String
    Dim check4 As String

        If CheckBox1.Checked = True Then
            check1 = CheckBox1.Text
        ElseIf CheckBox1.Checked = False Then
            check1 = ""
        End If

        If CheckBox2.Checked = True Then
            check2 = CheckBox2.Text
        ElseIf CheckBox2.Checked = False Then
            check2 = ""
        End If

        If CheckBox3.Checked = True Then
            check3 = CheckBox3.Text
        ElseIf CheckBox3.Checked = False Then
            check3 = ""
        End If

        If CheckBox4.Checked = True Then
            check4 = CheckBox4.Text
        ElseIf CheckBox4.Checked = False Then
            check4 = ""
        End If

checker = check1 + " " + check2 + " " + check3 + " " + check4

This is just a few of the checkboxes...
I want to store the text of checked boxes in a variable 'checker' but when checkbox1 is not checked there seems to be space before other text. I want to get rid of that space in case checkbox1 is not checked. I hope this is clear enough.