Data Gridview Join Table

    protected void Page_Load(object sender, EventArgs e)
    {
         if (!Page.IsPostBack)

        {

            BindData();

        }

    }

    public void BindData()

    {
      
   
        con = new SqlConnection(@"Data Source=localhost\SQLEXPRESS;initial Catalog=Demo1;integrated security=true;");
        cmd.CommandText = "select a.Emp_Name,a.Emp_Id,a.Emp_City,a.Emp_State,b.Emp_Salary From Emp_Details AS a INNER JOIN Emp_Salary AS b ON a.Emp_Id= b.Emp_Id";
        //cmd.CommandText = "select a.Emp_Name,a.Emp_Id,a.Emp_City,a.Emp_State,b.Emp_Salary From Emp_Details AS a ,Emp_Salary AS b where a.Emp_Id=b.Emp_Id AND b.Emp_Salary>=32000";
        //cmd.CommandText = "Select * from Emp_Details";

        cmd.Connection = con;

        da = new SqlDataAdapter(cmd);

        da.Fill(ds);

        con.Open();

        cmd.ExecuteNonQuery();

        Grid.DataSource = ds;

        Grid.DataBind();

        con.Close();

    }