asking web service in vb.net

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VB

My webservice code is here .............

<webmethod()> _
    <ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
    Public Function getConfigurationValueByKey(ByVal strKeyName As String) As String
        Dim sqlConnection As SqlConnection = New SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("ConnStr").ConnectionString)
        sqlConnection.Open()
        Dim sqlCommand As SqlCommand = New SqlCommand("SELECT * FROM table1 WHERE column1 ='" + strKeyName + "';", sqlConnection)
        Dim sqlDataset As DataSet = New DataSet()
        Dim sqlDataAdapter As SqlDataAdapter = New SqlDataAdapter(sqlCommand)
 
        sqlDataAdapter.Fill(sqlDataset)
        sqlConnection.Close()
 
        Dim MArray()() As String = New String(sqlDataset.Tables(0).Rows.Count)() {}
        Dim i As Integer = 0
 
        For Each rs As DataRow In sqlDataset.Tables(0).Rows
            MArray(i) = New String() {rs("userid").ToString(), rs("name").ToString()}
            i = i + 1
        Next
 
        Dim js As JavaScriptSerializer = New JavaScriptSerializer()
        Dim sJSON As String = js.Serialize(MArray)
        Return sJSON
    End Function

I want to put userid and name fied to seperate text box .how to get that field from json.