Reading a null value for TextBox.Text.

Hello!

I am trying to make a little automated program to make some changes to start services. I am using a button click event to run the following:

{
    
    #Define Variables
    $ComputerName = $WorkstationNameTextBox.Text
    $Credentials = $ServiceIDTextBox.Text
    $ServiceName = [ToString]$ServiceNameTextBox.Text

    #create session and set startup type
    $s = New-PSSession -ComputerName $ComputerName -Credential $Credentials
    Invoke-Command -Session $s -ScriptBlock {Set-Service -Name $ServiceName -StartupType Automatic

    #changing the Failure options
    sc.exe failure $ServiceName actions = restart/60000/restart/60000/restart/60000 reset= 86400;

    #Restart service
    Restart-Service -Name $ServiceName -Force -ErrorAction Stop}

Select allOpen in new window

I am getting an error with this script:

Cannot bind argument to parameter 'Name' because it is null.
    + CategoryInfo          : InvalidData: (:) [Set-Service], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.SetServiceCommand
    + PSComputerName        : MyComputerName
 
Cannot bind argument to parameter 'Name' because it is null.
    + CategoryInfo          : InvalidData: (:) [Restart-Service], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.RestartServiceCommand
    + PSComputerName        : MyComputerName

I am sure this is something small, but I cannot figure it out. Any Ideas as to why this is happening? And how to fix my issue.

Thank you!,
Shannon