como resolver

<?php


       if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $database = new Database();
             $empresa = new Empresa($database->getConnection());

             $empresa-> razao_social = $_POST['razaosocial'];
             $empresa-> cnpj = $_POST['cnpj'];
             $empresa-> inscricao_estadual = $_POST['inscricaoestadual'];


             if ($empresa->create()) {
            echo "<div class=\"alert alert-success alert-dismissable\">";
            echo "<button type=\"button\" class=\"close\" data-dismiss=\"alert\" aria-hidden=\"true\">&times;</button>";
            echo "Empresa Cadastrada.";
            echo "</div>";
            }
            else {
            echo "<div class=\"alert alert-danger alert-dismissable\">";
            echo "<button type=\"button\" class=\"close\" data-dismiss=\"alert\" aria-hidden=\"true\">&times;</button>";
            echo "Erro ao Cadastrar.";
            echo "</div>";
            }
        }

?>


*********************************************************

Meu HTML


<form action='php/Create_Empresa.php'  method='post' class="form-horizontal localformcademp" >
  <div class="control-group ">

    <h3><label class="control-label " for="razaoSocial">Dados da Empresa</label></h3>
    <label class="control-label " for="razaoSocial">Razão Social</label>
    <div class="controls ">
      <input type="text" id="razaosocial" name="razaosocial" class="tamanhocampo" placeholder="">
    </div>
  </div>
  <div class="control-group">
    <label class="control-label" for="Cnpj">Cnpj</label>
    <div class="controls">
      <input type="text" id="cnpj" name="cnpj" class="tamanhocampo" placeholder="">
    </div>
    <div class="control-group">
    <label class="control-label" for="InscricaoEstadual">Inscrição Estadual</label>
    <div class="controls">
      <input type="text" id="inscricaoestadual" name="inscricaoestadual" class="tamanhocampo" placeholder="">
    </div>

   </br>
   </br>
      <button type="submit" class="btn">Salvar</button>

  </div>
</form>