update query not working

<table>
        <tr>
            <td><asp:Label ID="Labelcontact1" runat="server" Text="Contact 1" CssClass="label"></asp:Label></td>
            <td><asp:TextBox ID="TextBoxContact1" runat="server" CssClass="textbox" ValidationGroup="updatebasics"></asp:TextBox></td>
        </tr>
        <tr>
            <td><asp:Label ID="Labelcontact2" runat="server" Text="Contact 2" CssClass="label"></asp:Label></td>
            <td><asp:TextBox ID="TextBoxContact2" runat="server" CssClass="textbox" ValidationGroup="updatebasics"></asp:TextBox></td>
        </tr>
        <tr>
            <td><asp:Label ID="Labelemail1" runat="server" Text="Email 1" CssClass="label"></asp:Label></td>
            <td><asp:TextBox ID="TextBoxEmail1" runat="server" CssClass="textbox" ValidationGroup="updatebasics"></asp:TextBox></td>
        </tr>
        <tr>
            <td><asp:Label ID="Labelemail2" runat="server" Text="Email 2" CssClass="label"></asp:Label></td>
            <td><asp:TextBox ID="TextBoxEmail2" runat="server" CssClass="textbox" ValidationGroup="updatebasics"></asp:TextBox></td>
        </tr>
        <tr>
            <td><asp:Button ID="ButtonSubmit" runat="server" Text="Update" CssClass="button" OnClick="ButtonSubmit_Click" ValidationGroup="updatebasics"/></td>
        </tr>
    </table>

public partial class Default2 : System.Web.UI.Page
{
    static string connstr = ConfigurationManager.ConnectionStrings["ethena"].ConnectionString;
    private static SqlConnection con = new SqlConnection(connstr);
    private static SqlCommand cmd;
    protected void Page_Load(object sender, EventArgs e)
    {
        cmd = new SqlCommand("select * from page_content", con);
        con.Open();
        SqlDataReader reader = cmd.ExecuteReader();
        while (reader.Read())
        {
            TextBoxContact1.Text=reader["contact1"].ToString();
            TextBoxContact2.Text = reader["contact2"].ToString();
            TextBoxEmail1.Text = reader["email1"].ToString();
            TextBoxEmail2.Text = reader["email2"].ToString();
        }
        con.Close();
    }
    protected void ButtonSubmit_Click(object sender, EventArgs e)
    {
        string query="UPDATE page_content SET contact1='"+TextBoxContact1.Text.Trim()+"',contact2='"+TextBoxContact2.Text.Trim()+"',email1='"+TextBoxEmail1.Text.Trim()+"',email2='"+TextBoxEmail2.Text.Trim()+"'";
        //Labelcontact1.Text = query;
        cmd = new SqlCommand(query, con);
        con.Open();
        cmd.ExecuteReader();
        con.Close();
    }
}