QueryStrint

FIrstForm

public partial class QueryStringParams1 : System.Web.UI.Page
{  
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection Cn = new SqlConnection(
            "Data Source=.;Initial Catalog=anil;Persist Security Info=True;User ID=sa;Password=123");
       
        SqlDataAdapter Da = new SqlDataAdapter(
            "select * from dept", Cn);
       
        DataSet Ds = new DataSet();
        Da.Fill(Ds, "Dept");
        GvDept.DataSource = Ds.Tables["Dept"];
        GvDept.DataBind();
        GvDept.DataKeyNames =
            new string[] { "Deptno" };
    }
    protected void GvDept_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
    {
        GvDept.SelectedIndex=e.NewSelectedIndex;
   
        string Dno = GvDept.SelectedValue.ToString();
       
        Server.Transfer(
            "~/QueryStringParams2.Aspx?Dno=" + Dno);
    }

Form2
Take a Grid View
public partial class QueryStringParams2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
        string Dno = Request.QueryString["Dno"];
   
        SqlConnection Cn = new SqlConnection(
            "Data Source=.;Initial Catalog=anil;Persist Security Info=True;User ID=sa;Password=123");
       
        SqlCommand Cmd = new SqlCommand(
            "select * from emp where deptno=" + Dno, Cn);
       
        Cn.Open();
        SqlDataReader Dr = Cmd.ExecuteReader();
        GvEmp.DataSource = Dr;
        GvEmp.DataBind();
        Cn.Close();
    }