Print Nth Worksheet To Mth Worksheet using VBA

I want to create vba code that will print the specific Worksheet, From - To,No. of Copies.
I have 3 textboxes and 1 combobox.
1.txtFrom
2.txtTo
3.txtCopy
4.cmbListForm

My Combobox List Down the Forms.
I've search code but i don't know how to execute this.

Code:

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x= cmbListForm.List
Worksheets("X").PrintOut Copies:=txtCopy.Value, from:txtFrom.Value, To:=txtTo.Value

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Here is my workbook.

Guys, I already solve my own problem using this code.
Thanks.

Code:

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Private Sub CommandButton2_Click()
Dim form As String
form = cmbForm.Value

If txtFrom.Value = "" Then
MsgBox "Type Start Page"

ElseIf txtTo.Value = "" Then
MsgBox "Type End Page"

ElseIf txtCopy.Value = "" Then
MsgBox "Type Number of Copies"

Else
Worksheets(form).PrintOut Preview:=True, From:=txtFrom.Value, To:=txtTo.Value, Copies:=txtCopy.Value
End If
End Sub

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Thanks for posting Ryan