Forms Data Controls :: Display Values Into Form Fields

I am populating data into formfields when i select checkbox in a grid view with the following code.I have 20 record set in database,Quotenumber(Main column) starts 3001 ,3002,3003..........3020.I am allowing duplicate entries meant that i have 4 recordset only on 3000 quotenumber like wise i may have 3or more record set on 3010,problem here is when i select first one of 3000(Quotenumber) it is supposed to populate the record set of first one of 3000 but only last one of 3000(quotenumber) is getting populated into form field.Can any one provide solution to this.

Code for Populating Data into formfield when you select checkbox ina grid view.

Dim indx As Integer
Dim connectionString As String = "Database=xxxx;" & "Data Source=localhost;" & "User Id=root;Password=xxxx"
Dim query As String = "SELECT QuoteNumber,Revision,Vendor,PartNumber FROM quotes order by QuoteNumber"
Dim connection As New MySqlConnection(connectionString)
Dim da As New MySqlDataAdapter(query, connection)
Dim ds As New DataSet()
Dim myAdapter As New MySqlDataAdapter
myAdapter = New MySqlDataAdapter(query, connection)
myAdapter.Fill(ds, "QUOTES")
Dim dt As DataTable = New DataTable() 'DataTable Initializes a new instance of the DataTable class with no arguments.
da.Fill(dt)
Dim checkbox As CheckBox = CType(sender, CheckBox)
checkbox.Checked = True
Dim row As GridViewRow = CType(checkbox.NamingContainer, GridViewRow)
Dim i As Integer
For i = 0 To dt.Rows.Count - 1 Step i + 1
If (dt.Rows(i)("QuoteNumber").ToString = row.Cells(1).Text.ToString()) Then
indx = i
End If
Next
DDQuote.Text = dt.Rows(indx)("QuoteNumber").ToString()
txtRev.Text = dt.Rows(indx)("Revision").ToString()
DDVend.Text = dt.Rows(indx)("Vendor").ToString()
txtPart.Text = dt.Rows(indx)("PartNumber").ToString()

GridView code

<asp:GridView ID="GVData" runat="server" Height="75px" Width="76px" CaptionAlign="Top"
Font-Size="Medium" EnableModelValidation="True"
BackColor="White" BorderColor="#010101" BorderStyle="Groove"
BorderWidth="1px" CellPadding="4" AlternatingRowStyle-BackColor = "#87CEFA">
<Columns><asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" AutoPostBack="true" QuotesKey='<%#Eval("QuoteNumber").ToString() %>' onclick="jsEnableDisableDeleteButton(this);" OnCheckedChanged="chkSelect_CheckedChanged" />
</ItemTemplate>
</asp:TemplateField></Columns>
<EditRowStyle BorderColor="#FFFFCC" />
<FooterStyle BackColor="White" ForeColor="#330099" />
<RowStyle BackColor="#F0F8FF" ForeColor="Black" />
<HeaderStyle BackColor="#F06300" Font-Bold="false" ForeColor="#FFFFCC" />
<AlternatingRowStyle BackColor="#ADD8E6"></AlternatingRowStyle>
</asp:GridView>