Not displaying anything in Gridview

Question

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Configuration;

using System.Data.SqlClient;

using System.Data;

public partial class DispalyData : System.Web.UI.Page

{

    string strcon = ConfigurationManager.ConnectionStrings["TestConnectionString"].ToString();

    protected void Page_Load(object sender, EventArgs e)

    {

        SqlConnection con = new SqlConnection(strcon);

        

     

        SqlCommand cmd = new SqlCommand("Select * from ws_Students where DOB=@DOB", con);

        SqlParameter param = new SqlParameter("@DOB",DbType.DateTime);

        param.Value = DateTime.Now.ToString();

        cmd.Parameters.Add(param);

        con.Open();

        SqlDataReader dr = cmd.ExecuteReader();

        GridView1.DataSource = dr;

        GridView1.DataBind();

        con.Close();

    }

    

}

This is the code where I want to display ID, Name, Scholar from table ws_Students and also added DOB as parameter in a Gridview.  But error is not showing and gridview is not displayed in browser. Is there any thing to add in database or in cs file?

Please provide solution . Thanks in Advance.