Cannot upload files via Powershell GUI

Thank you both for clarifying. This is my first attempt to make a powershell gui, so any help and claryfication is appriciated.

@oBda
Your changes did the job, but as with so many other aspects in life, one answer rises two new questions :-)
I have tried to add a simple error handling, where I check if the source and destination files have the same hash.
When the form is loaded, I dont want to show any text in $lblResult, but after I have submitted the file, I want to show one of the messages, depending on the result of the hash-check. But nothing happens.

With my limited understanding of the GUI concept, I would guess that I could put the refresh part in where i did, but...

$sourceHash = Get-FileHash $FilePath
    $destHash   = Get-FileHash "$destPath\Test.csv"

        if($sourceHash -eq $destHash)
        {
            $lblResult.text       = "Filen er nu overført til $FilePath"
            $lblResult.ForeColor  = '#009933'
	         $PuzzelFileUpload.Refresh()
        }
        ELSE
        {
            $lblResult.text       = "Filen er IKKE nu overført"
            $lblResult.ForeColor  = '#ff0000'
	         $PuzzelFileUpload.Refresh()
        }

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Complete script here:

$Button = 'system.Windows.Forms.Button'
$SanSerif10Bold = 'Microsoft Sans Serif,10,style=Bold'
$sanSerif10 = 'Microsoft Sans Serif,10'
$sanSerif8 = 'Microsoft Sans Serif,8'
$SysDrawPoint = 'System.Drawing.Point'
# InitialDirectory not defined in submitted code
$InitialDirectory = $env:USERPROFILE #dummy initial directory

Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()

#region begin GUI{ 

$PuzzelFileUpload                = New-Object -TypeName system.Windows.Forms.Form
$PuzzelFileUpload.ClientSize     = '400,124'
$PuzzelFileUpload.text           = 'Puzzel File Uploader'
$PuzzelFileUpload.TopMost        = $false

$txtFileName                     = New-Object -TypeName system.Windows.Forms.TextBox
$txtFileName.multiline           = $false
$txtFileName.width               = 280
$txtFileName.height              = 20
$txtFileName.location            = New-Object -TypeName $SysDrawPoint -ArgumentList (107,39)
$txtFileName.Font                = $sanSerif10

$btnFileBrowser                  = New-Object -TypeName $Button
$btnFileBrowser.BackColor        = '#858585'
$btnFileBrowser.text             = 'BROWSE'
$btnFileBrowser.width            = 79
$btnFileBrowser.height           = 38
$btnFileBrowser.location         = New-Object -TypeName $SysDrawPoint -ArgumentList (16,25)
$btnFileBrowser.Font             = $SanSerif10Bold
$btnFileBrowser.ForeColor        = '#ffffff'

$lblFileName                     = New-Object -TypeName system.Windows.Forms.Label
$lblFileName.text                = 'Filnavn'
$lblFileName.AutoSize            = $true
$lblFileName.width               = 25
$lblFileName.height              = 10
$lblFileName.location            = New-Object -TypeName $SysDrawPoint -ArgumentList (110,21)
$lblFileName.Font                = $sanSerif10

$lblResult                       = New-Object -TypeName system.Windows.Forms.Label
$lblResult.text                  = ''
$lblResult.width                 = 270
$lblResult.height                = 30
$lblResult.location              = New-Object -TypeName $SysDrawPoint -ArgumentList (10,78)
$lblResult.Font                  = $SanSerif8
$lblResult.ForeColor             = ''

$btnUpload                       = New-Object -TypeName $Button
$btnUpload.BackColor             = '#7ed321'
$btnUpload.text                  = 'Upload'
$btnUpload.width                 = 96
$btnUpload.height                = 30
$btnUpload.location              = New-Object -TypeName $SysDrawPoint -ArgumentList (291,78)
$btnUpload.Font                  = $SanSerif10Bold
$btnUpload.ForeColor             = '#000000'

$PuzzelFileUpload.controls.AddRange(@($txtFileName, $btnFileBrowser, $lblFileName, $lblResult, $btnUpload))

#region gui events {
$btnFileBrowser.Add_Click({
	Add-Type -AssemblyName System.windows.forms | Out-Null
		
	$OpenFileDialog = New-Object -TypeName System.Windows.Forms.OpenFileDialog
	$OpenFileDialog.initialDirectory = $initialDirectory
	$OpenFileDialog.filter = 'CSV (*.csv)| *.csv'
	$OpenFileDialog.ShowDialog() | Out-Null
	$filePath = $OpenFileDialog.filename

	$txtFileName.Text = $filePath 
	$PuzzelFileUpload.Refresh()
})
$btnUpload.Add_Click({
	$destPath = '\\server1.my.domain.dk\Puzzel\'
    
    Copy-Item -Path $txtFileName.Text -Destination $destPath

    $sourceHash = Get-FileHash $FilePath
    $destHash   = Get-FileHash "$destPath\Test.csv"

        if($sourceHash -eq $destHash)
        {
            $lblResult.text       = "Filen er nu overført til $FilePath"
            $lblResult.ForeColor  = '#009933'
	        $PuzzelFileUpload.Refresh()
        }
        ELSE
        {
            $lblResult.text       = "Filen er IKKE nu overført"
            $lblResult.ForeColor  = '#ff0000'
	        $PuzzelFileUpload.Refresh()
        }

})

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Found the answer to the last bit... I forgot to remove .text '' and .forecolor '' from

$lblResult                       = New-Object -TypeName system.Windows.Forms.Label
$lblResult.text                  = ''
$lblResult.width                 = 270
$lblResult.height                = 30
$lblResult.location              = New-Object -TypeName $SysDrawPoint -ArgumentList (10,78)
$lblResult.Font                  = $SanSerif8
$lblResult.ForeColor             = ''

Select allOpen in new window

Thank you both - I really appriciate the help.