DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'name'

<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource2" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged1" DataTextField="socialname">
                                 <asp:ListItem text="select">Comment using
                             
                             <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:prakashConnectionString %>" SelectCommand="SELECT [socialname] FROM [socialnetwork]">
                             <asp:Label ID="Label3" runat="server" Text="Label">

protected void Bindddl() {

    con.Open();
    SqlCommand cmd = new SqlCommand("select * from socialnetwork", con);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);
    DropDownList1.DataTextField = "socialname";
    DropDownList1.DataValueField = "name";
    DropDownList1.DataBind();
    con.Close();
}

protected void BindTitle()
{
    if (DropDownList1 != null)
    {
        foreach (ListItem li in DropDownList1.Items)
        {
            li.Attributes["title"] = "social/" + li.Value; // it ll set the value of items in dropdownlist as tooltip

        }
    }
}

protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
{
    BindTitle();
    Label3.Text = DropDownList1.SelectedItem.Text;
    Label3.Text = "Commented by";
}