Power Shell script to delete SharePoint Property bag Values.

# Add Powershell Snapin

Add-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue

# Set the variable to removed from property bag

$RemovePropertyBag = "DBConString"

# Get the central admin URL to delete the Property bag value at farm level

$SiteUrl = Get-SPWebApplication -includecentraladministration | where { $_.DisplayName -eq "Sharepoint Central Administration v4" }

# Load Required Assemblies

[System.Reflection.Assembly]::Load("Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")

[System.Reflection.Assembly]::Load("Microsoft.Practices.ServiceLocation, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")

[System.Reflection.Assembly]::Load("Microsoft.Practices.SharePoint.Common, Version=2.0.0.0, Culture=neutral, PublicKeyToken=ef4330804b3c4129")

 $site = New-Object Microsoft.SharePoint.SPSite($SiteUrl.URL)

# Get Service locator context and config Manager to set the site context

$serviceLocator = [Microsoft.Practices.SharePoint.Common.ServiceLocation.SharePointServiceLocator]::GetCurrent()

$configManager = $serviceLocator.GetInstance([Microsoft.Practices.SharePoint.Common.Configuration.IConfigManager])

$configManager.SetWeb($site.RootWeb);

 # Get Property Bag

$farmBag = $configManager.GetPropertyBag([Microsoft.Practices.SharePoint.Common.Configuration.ConfigLevel]::CurrentSPFarm)

# set the Value

$configManager.SetInPropertyBag($RemovePropertyBag, "", $farmBag)

write-host "Removing PropertyBag Values $RemovePropertyBag successful"