Public Property LockIssue As String

Dim instance As SPSite
Dim value As String

value = instance.LockIssue

instance.LockIssue = value

public string LockIssue { get; set; }

Using oSiteCollection As New SPSite("http://Site_Name")
    oSiteCollection.WriteLocked = True
    oSiteCollection.ReadLocked = False
    oSiteCollection.LockIssue = "Customer did not pay bill."
End Using

using (SPSite oSiteCollection = new SPSite("http://Site_Name"))
{
    oSiteCollection.WriteLocked = true;
    oSiteCollection.ReadLocked  = false;
    oSiteCollection.LockIssue   = "Customer did not pay bill.";
}