แก้ไข error แก้ยังไงก็แก้ไม่ได้ The data types text and varchar are incompatible in the equal to operator

Dim objConn As System.Data.OleDb.OleDbConnection
Dim objCmd As System.Data.OleDb.OleDbCommand
Dim strConnString,strSQL As String
Dim myScalar As Object

strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="&Server.MapPath("database/mydatabase.mdb")&";Jet OLEDB:Database Password=;"
objConn = New System.Data.OleDb.OleDbConnection(strConnString)
objConn.Open()

strSQL = "SELECT MAX(Used) FROM customer"

      objCmd = New System.Data.OleDb.OleDbCommand()
      With objCmd
          .Connection = objConn
          .CommandType = CommandType.Text
          .CommandText = strSQL
      End With

      myScalar = objCmd.ExecuteScalar
			
objCmd = Nothing
objConn.Close()
objConn.Close()
objConn = Nothing

Dim objConn As New SqlConnection
        Dim objCmd As New SqlCommand
        Dim strConnString, strSQL As String

        strConnString = "Server=saengtawan-pc\sql2008;UID=sa;PASSWORD=111111;Database=mydatabase;Max Pool Size=400;Connect Timeout=600;"
        objConn.ConnectionString = strConnString
        objConn.Open()

        Dim intNumRows As Integer
        strSQL = "SELECT COUNT(*) FROM mytable WHERE name = '" & Me.txtName.Text & "' AND pass = '" & Me.txtPass.Text & "' "
        objCmd = New SqlCommand(strSQL, objConn)
        intNumRows = objCmd.ExecuteScalar()