Forms Data Controls :: Get Data In A Textbox NOT Gridview

Imports System.Data.SqlClient
Imports System.Data
Partial Class project_request_make_request
Inherits System.Web.UI.Page
Dim conn As SqlConnection
Dim cmd As SqlCommand
Dim dst As DataSet
Dim dad As SqlDataAdapter
Dim strSql As String
Dim dtr As SqlDataReader
Dim sqlString As String
Dim strConn As String = ConfigurationManager.AppSettings("sqlconnectionstring")
strSql = ("SELECT TOP 1 request_Id as [Request ID] FROM tbl_request ORDER BY request_Id desc")
conn = New SqlConnection(strConn)
cmd = New SqlCommand(strSql, conn)
conn.Open()
dtr = cmd.ExecuteReader()
gridview1.DataSource = dtr
gridview1.DataBind()
_________
Request ID
--------------
30003
_________

The code above displays the data in one cell inside a gridview, but I want to display this one cell of data in a textbox (data 30003 should be displayed in a textbox).