Send data to other page on ASP.Net GridView LinkButton Click using C#

Hi acne.star52,

Please get the session value inside the page load. 

Please refer below sample.

HTML

Default

<asp:GridView runat="server" AutoGenerateColumns="false" ID="gvDetails">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkED" Text="Edit" runat="server" OnClick="lnkED_Click" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField HeaderText="CustomerId" DataField="CustomerId" />
        <asp:BoundField HeaderText="Name" DataField="Name" />
        <asp:BoundField HeaderText="Country" DataField="Country" />
    </Columns>
</asp:GridView>
<asp:Button ID="btnNew" Text="Create New" runat="server" OnClick="btnNew_Click" />

Home

<table>
    <tr>
        <td>Name:</td>
        <td>
            <asp:TextBox runat="server" ID="txtName" />
        </td>
    </tr>
    <tr>
        <td>Country</td>
        <td>
            <asp:TextBox runat="server" ID="txtCountry" />
        </td>
    </tr>
    <tr>
        <td></td>
        <td>
            <asp:Button ID="btnSave" Text="Save" runat="server" OnClick="btnSave_Click" />
        </td>
    </tr>
</table>

Namespaces

Default

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

Home

using System.Data;
using System.Configuration;
using System.Data.SqlClient;

Code

Default

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

private void BindGrid()
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT CustomerId,Name,Country FROM Customers", con))
        {
            con.Open();
            gvDetails.DataSource = cmd.ExecuteReader();
            gvDetails.DataBind();
            con.Close();
        }
    }
}

protected void btnNew_Click(object sender, EventArgs e)
{
    Response.Redirect("Home.aspx");
}

protected void lnkED_Click(object sender, EventArgs e)
{
    GridViewRow gvRow = (sender as LinkButton).NamingContainer as GridViewRow;
    int customerId =int.Parse(gvRow.Cells[1].Text);
    string name = gvRow.Cells[2].Text;
    string country = gvRow.Cells[3].Text;
    Session["customerId"] = customerId.ToString();
    Session["name"] = name.ToString();
    Session["country"] = country.ToString();
    Response.Redirect("Home.aspx");
}

Home

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        txtName.Text = Session["name"].ToString();
        txtCountry.Text = Session["country"].ToString();
    }
}

protected void btnSave_Click(object sender, EventArgs e)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlCommand cmd = new SqlCommand("INSERT INTO Customers VALUES (@Name,@Country)", con))
        {
            cmd.Parameters.AddWithValue("@Name", txtName.Text.Trim());
            cmd.Parameters.AddWithValue("@Country", txtCountry.Text.Trim());
            con.Open();
            cmd.ExecuteReader();
            con.Close();
        }
    }
    Response.Redirect("Default.aspx");
}

Screenshot