how to get textfields in a textbox?

[Akii]

Sorry 4 that question, but i'm very new and can't solve the problem by myself.

I put all data in a datatable like this:

[...]
da = New MySqlDataAdapter(sql, conn)
cb = New MySqlCommandBuilder(da)
dt = New DataTable
da.Fill(dt)

Getting the data like

Me.RichTextBox1.text = dt.rows(i).Item(j)

works with all fields except for textfields (=blob)

Can someone help me with a some code how I can write and read - into and from text-(blob)-fields?

thanks a lot
Akii