i want to add status code using asp.net

Question

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

public partial class Venderview : System.Web.UI.Page
{
string strConn = ConfigurationManager.ConnectionStrings["connect"].ConnectionString;
DataSet objUserDs = new DataSet();

SqlDataAdapter objUserDa;

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection con = new SqlConnection(strConn);
con.Open();
SqlCommand objUserCmd = new SqlCommand("select * from Asset_Vendor", con);
objUserDa = new SqlDataAdapter(objUserCmd);
objUserDa.Fill(objUserDs);
grdVendoradd.DataSource=objUserDs;
DataBind();
}
}
protected void btnAdd_Click(object sender, EventArgs e)
{
Response.Redirect("VendorAdd.aspx");
}

protected void btnUpdate_Click(object sender, EventArgs e)
{
String str = Request.Form["rdoUser"];
Response.Redirect("Vendor_Update.aspx?Vendor_Id=" + str);
}


protected void btnDelete_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(strConn);
con.Open();
String str = Request.Form["rdoUser"];
SqlCommand objUserCmd = new SqlCommand("delete from Asset_Vendor where Vendor_Id=@vid", con);
SqlParameter paramUid = new SqlParameter("@vid", SqlDbType.VarChar, 50);
paramUid.Value = str;
objUserCmd.Parameters.Add(paramUid);
objUserCmd.ExecuteNonQuery();
Response.Redirect("Vender_view.aspx");

}


}


my question is instead of delete i want to update the status...in gridview page?