How do I use use checklistbox to make an SQL merge delete statement?

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VB

So Thanks to Richard I was able to allow users to click on checklistbox items and use them in the creation of an sql table inside vb.net. SO, I tried to take his awesome example and use it in a similar way. so far here is what I have:

Dim cb As New System.Text.StringBuilder("MERGE INTO")
       Dim tableName As String = ListBox1.SelectedItems(Convert.ToString(tableName))
       Dim tablename2 As String = ListBox2.SelectedItems(Convert.ToString(tablename2))
       cb.AppendFormat(" [{0}] ", tableName.Replace("]", "]]"))
       cb.Append("as T")
       cb.AppendFormat(" using [{0}] ", tablename2.Replace("]", "]]"))
       cb.Append("As S")
       '   cb.AppendFormat(", [{0}] nvarchar(max) NULL", tableName.Replace("]", "]]"))

       For Each item In CheckedListBox1.CheckedItems
           Dim columnName As String = Convert.ToString(item)
           cb.AppendFormat("on T." + columnName.Replace("]", "]]") + "[{0}]S." + columnName.Replace("]", "]]"))
       Next
       cb.Append(")")

       Dim sql As String = cb.ToString()

       sqlcon.Open()
       Dim cmd As SqlClient.SqlCommand
       cmd = New SqlClient.SqlCommand(sql, sqlcon)

       cmd.ExecuteNonQuery()
       sqlcon.Close()

here is the sql statement I am trying to work into this code:

Merge into table1 as T
using [table] as S
on T.[Last Name] = S.[Last Name] and T.[First Name] = S.[First Name]

When Matched then 
Update Set T.[age] = S.[age];

DELETE T1 FROM [table] T1 JOIN [table1] T2 ON T1.[Last Name] = T2.[Last Name] AND T1.[First Name] = T2.[First name];

I am needing help working this in. I am having a hard time with the ands and do I start a new string builder for the when matched and delete from?

What I have tried:

I have replaced multiple characters to make the sql string accurate.