Send GridView row data to controls in another page using VB.Net in ASP.Net

Hi Avisai,

I have created sample using northwind database, please refer below code.

HTML

DefaultPage

<div>
    <table>
        <tr>
            <td>
                Country:
            </td>
            <td>
                <asp:DropDownList runat="server" ID="ddlCountry">
                    <asp:ListItem Text="-Select-" Value="Select" />
                    <asp:ListItem Text="Belgium" Value="Belgium" />
                    <asp:ListItem Text="Canada" Value="Canada" />
                    <asp:ListItem Text="USA" Value="USA" />
                </asp:DropDownList>
            </td>
            <td>
                <asp:Button Text="Search" runat="server" ID="btnSearch" OnClick="Search" />
            </td>
        </tr>
    </table>
    <br />
    <br />
    <asp:GridView ID="gvDetails" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
        RowStyle-BackColor="#A1DCF2" AlternatingRowStyle-BackColor="White" AlternatingRowStyle-ForeColor="#000"
        runat="server" AutoGenerateColumns="false" AllowPaging="true" PageSize="10">
        <Columns>
            <asp:BoundField DataField="CustomerID" HeaderText="Customer Id" ItemStyle-Width="30" />
            <asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <asp:Label ID="lblName" runat="server" Text='<%# Eval("ContactName") %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="150" />
            <asp:TemplateField HeaderText="Send Data">
                <ItemTemplate>
                    <asp:HyperLink ID="lnkDetails" runat="server" NavigateUrl='<%# string.Format("~/DetailsPage.aspx?CustomerID={0}&ContactName={1}&Country={2}", Eval("CustomerID").ToString(), Eval("ContactName").ToString(), Eval("Country").ToString()) %>'
                        Text="Send Details" />
                    <%--<asp:LinkButton ID="lnkDetails" runat="server" Text="Send Details" PostBackUrl='<%# "~/DetailsCS.aspx?RowIndex=" + Container.DataItemIndex %>'></asp:LinkButton>--%>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

DetailsPage

<div>
    <table>
        <tr>
            <td>
                <b>Customer Id</b>
            </td>
            <td>
                <asp:TextBox runat="server" ID="txtCustomerId" />
            </td>
        </tr>
        <tr>
            <td>
                <b>Name</b>
            </td>
            <td>
                <asp:TextBox ID="txtContactName" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                <b>Country</b>
            </td>
            <td>
                <asp:DropDownList runat="server" ID="ddlCountry">
                    <asp:ListItem Text="Belgium" Value="1" />
                    <asp:ListItem Text="Canada" Value="2" />
                    <asp:ListItem Text="USA" Value="3" />
                </asp:DropDownList>
            </td>
        </tr>
    </table>
</div>

Code

DefaultPage

Private str As String = ConfigurationManager.ConnectionStrings("conString").ConnectionString
Protected Sub Page_Load(sender As Object, e As EventArgs)
	If Not Me.IsPostBack Then
		Me.BindGrid(String.Empty)
	End If
End Sub

Protected Sub Search(sender As Object, e As EventArgs)
	Dim filter As String = ddlCountry.SelectedValue
	If filter <> "Select" Then
		filter = (Convert.ToString(" WHERE Country ='") & filter) + "'"
		Me.BindGrid(filter)
	Else
		Me.BindGrid(String.Empty)
	End If
End Sub

Private Sub BindGrid(filter As String)
	Dim table1 As New DataTable("Details")
	table1.Columns.Add("CustomerID")
	table1.Columns.Add("ContactName")
	table1.Columns.Add("Country")
	table1.Rows.Clear()
	Dim conSQL As New SqlConnection(str)
	conSQL.Open()
	Dim cmdSQL As New SqlCommand(Convert.ToString("SELECT CustomerID,ContactName,Country FROM Customers") & filter)
	cmdSQL.Connection = conSQL
	Dim adptSQL As New SqlDataAdapter(cmdSQL)
	Dim myDataSet As New DataSet()
	adptSQL.Fill(myDataSet)
	conSQL.Close()
	Dim _with1 = myDataSet.Tables(0)
	For rowNumber As Integer = 0 To _with1.Rows.Count - 1
		Dim _with2 = _with1.Rows(rowNumber)
		table1.Rows.Add(_with2.ItemArray(0), _with2.ItemArray(1), _with2.ItemArray(2))
	Next
	If _with1.Rows.Count = 0 Then
		table1.Rows.Add("", "", "")
	End If
	gvDetails.DataSource = table1
	gvDetails.DataBind()
End Sub

DetailsPage

Protected Sub Page_Load(sender As Object, e As EventArgs)
	If Not IsPostBack Then
		txtCustomerId.Text = Request.QueryString("CustomerID")
		txtContactName.Text = Request.QueryString("ContactName")
		ddlCountry.SelectedItem.Text = Request.QueryString("Country")
	End If
End Sub

Screenshot