Bind Tex-box from another page

Hello! i m using asp.net i want to bind texbox from Gridview Page to Registration page to fill and update if i click Edit Bottun , almost seccessfully redirect of two page but my problem is No textbox binding help me guys.

in Gridview page

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

{

if (e.CommandName == "EditButton")

{

int index = Convert.ToInt32(e.CommandArgument);

GridViewRow row = GridView1.Rows[index];

Response.Redirect("~/Customers.aspx?Custid=" + row.Cells[1].Text);

}