Use user input values in Asp.net c# webforms

Question

I created a form for the user to update the registration data. The user’s "old" data is stored in session variables that fill out the form as soon as the user clicks to update registration. The problem is that when saving the data in the database, the data entered by the session variables are considered instead of the new data entered in the form. Can you help me solve this? Thank you. Follow the code C#:

protected void btnEnviar_Click(object sender, EventArgs e)
    {
        MySqlConnection conexao = ConexaoDB.GetConexao();
        try
        {
            string comandoSQL = "UPDATE MA_USERS SET " +
            "nomecliente = '{1}', " +
            "facebook = '{2}', " +
            "website = '{3}', " +
            "cidade = '{4}', " +
            "estado = '{5}', " +
            "emailprofissional = '{6}' " +
            "where idcliente= '{0}'";

            comandoSQL = string.Format(comandoSQL, txtUsuario.Text, 
            txtNome.Text, txtFacebook.Text, txtWebsite.Text, txtLocal.Text, ddlEstado.Text, txtEmail.Text);
            Response.Write("<script>alert('" +comandoSQL+ "');</script>");
            MySqlCommand comando = new MySqlCommand(comandoSQL, conexao);
            comando.ExecuteNonQuery();
        }
        finally
        {
            conexao.Close();
        }
    }
}

And the form code . aspx:

<div class="col-xs-8 col-xs-offset-2 form-div">
    <form id="form1" runat="server">
        <div style="padding: 10px; padding-top: 50px; width: 400px; margin-left: auto; margin-right: auto; background-color: #f6f3f3;">


            <h3>Update your informations:</h3>

            <p>Name:</p>
            <asp:TextBox ID="txtNome" runat="server" CssClass="textobox" Width="382px"></asp:TextBox>
            <p>Facebook:</p>
            <asp:TextBox ID="txtFacebook" runat="server" CssClass="textobox" Width="182px"></asp:TextBox>
            <br />
            <p>Website:</p>
            <asp:TextBox ID="txtWebsite" runat="server" CssClass="textobox" Width="382px"></asp:TextBox>
            <p>Professional E-mail:</p>
            <asp:TextBox ID="txtEmail" runat="server" CssClass="textobox" Width="382px"></asp:TextBox>
            <p>City:</p>
            <asp:TextBox ID="txtLocal" runat="server" CssClass="textobox" Width="262px"></asp:TextBox>
            <p>State:</p>
            <asp:DropDownList ID="ddlEstado" runat="server"></asp:DropDownList>


            <br /><br /><br />
            <asp:Button ID="btnEnviar" runat="server" Text="Send" OnClick="btnEnviar_Click" />&nbsp;&nbsp;&nbsp;&nbsp;
            <br />
            <asp:Label ID="lblErros" runat="server"></asp:Label>
            <asp:TextBox ID="txtUsuario" runat="server" Visible="False"></asp:TextBox>
        </div>
    </form>
</div>