Cannot insert explicit value for identity column" even when I SET IDENTITY_INSERT on

private void btnSave_Click(object sender, RoutedEventArgs e)
       {
           try
           {
               if (isValid())
               {
                  // id1 = picUserimage.Source.ToString();
                   SqlConnection conn = new SqlConnection(ConnectionString);
                   conn.Open();
                   SqlCommand cmd = new SqlCommand("add_profile_sp", conn);
                   cmd.CommandType = CommandType.StoredProcedure;
                   cmd.Parameters.AddWithValue("@company_id", SqlDbType.Int).Value = string.IsNullOrWhiteSpace(txtCompanyId.Text) ? DBNull.Value : (object)txtCompanyId.Text;
                   cmd.Parameters.AddWithValue("@company_name", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtCompanyName.Text) ? DBNull.Value : (object)txtCompanyName.Text;
                   cmd.Parameters.AddWithValue("@caption", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtCaption.Text) ? DBNull.Value : (object)txtCaption.Text;
                   cmd.Parameters.AddWithValue("@address1", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtAddress1.Text) ? DBNull.Value : (object)txtAddress1.Text;
                   cmd.Parameters.AddWithValue("@address2", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtAddress2.Text) ? DBNull.Value : (object)txtAddress2.Text;
                   cmd.Parameters.AddWithValue("@mobileno", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtMobile.Text) ? DBNull.Value : (object)txtMobile.Text;
                   cmd.Parameters.AddWithValue("@email", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtEmail.Text) ? DBNull.Value : (object)txtEmail.Text;
                   cmd.Parameters.AddWithValue("@gst", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtGstin.Text) ? DBNull.Value : (object)txtGstin.Text;
                   cmd.Parameters.AddWithValue("@cloudApi", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtCloudApi.Text) ? DBNull.Value : (object)txtCloudApi.Text;
                   cmd.Parameters.AddWithValue("@username", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtUsername.Text) ? DBNull.Value : (object)txtUsername.Text;
                   cmd.Parameters.AddWithValue("@password", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtPassword.Password) ? DBNull.Value : (object)txtPassword.Password;
                   cmd.Parameters.AddWithValue("@selectusertype", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtcombox.Text) ? DBNull.Value : (object)txtcombox.Text;
                   cmd.Parameters.AddWithValue("@uploadlogo", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(id1) ? DBNull.Value : (object)id1;
                   //cmd.Parameters.AddWithValue("@uploadlogo", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(picUserimage.Source.ToString()) ? DBNull.Value : (object)picUserimage.Source.ToString();
                   cmd.Parameters.AddWithValue("@activationkey", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtActivationKey.Text) ? DBNull.Value : (object)txtActivationKey.Text;
                   cmd.Parameters.AddWithValue("@createdby", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(txtCreatedby.Text) ? DBNull.Value : (object)txtCreatedby.Text;
                   cmd.Parameters.AddWithValue("@date", SqlDbType.Date).Value = string.IsNullOrWhiteSpace(txtDate.Text) ? DBNull.Value : (object)txtDate.Text;
                   cmd.ExecuteNonQuery();
                   conn.Close();
                   MessageBox.Show("Successfully saved", "Fill Field", MessageBoxButton.OK, MessageBoxImage.Information);
                   refresh();
                   btnUpdate.IsEnabled = false;
                   New_Add_Profile nap = new New_Add_Profile();
                   nap.Show();
                   this.Close();
               }
           }
           catch (SqlException ex)
           {
               MessageBox.Show(ex.Message);
           }
       }

CREATE TABLE add_profile
( company_id int IDENTITY(1,1) PRIMARY KEY,
company_name varchar(100),
caption varchar(100),
address1 varchar(100),
address2 varchar(100),
mobileno varchar(100),
email varchar(100),
gst varchar(100),
cloudApi varchar(100),
username varchar(100),
password varchar(100),
selectusertype varchar(100),
uploadlogo varchar(100),
activationkey varchar(100),
createdby varchar(100),
date date
)