diff --git a/docs/en/Repositories.md b/docs/en/Repositories.md
index 7ed10b9bb8..dc82876efb 100644
--- a/docs/en/Repositories.md
+++ b/docs/en/Repositories.md
@@ -222,8 +222,8 @@ public class PersonRepository : EfCoreRepository<MyDbContext, Person, Guid>, IPe
 
     public async Task<Person> FindByNameAsync(string name)
     {
-        var dbSet = await GetDbSetAsync();
-        return await dbSet.Set<Person>()
+        var dbContext = await GetDbContextAsync();
+        return await dbContext.Set<Person>()
             .Where(p => p.Name == name)
             .FirstOrDefaultAsync();
     }
diff --git a/modules/docs/app/VoloDocs.Web/VoloDocsWebModule.cs b/modules/docs/app/VoloDocs.Web/VoloDocsWebModule.cs
index 020ff807bf..07556b9b1a 100644
--- a/modules/docs/app/VoloDocs.Web/VoloDocsWebModule.cs
+++ b/modules/docs/app/VoloDocs.Web/VoloDocsWebModule.cs
@@ -123,6 +123,7 @@ namespace VoloDocs.Web
             {
                 options.Languages.Add(new LanguageInfo("cs", "cs", "Čeština"));
                 options.Languages.Add(new LanguageInfo("en", "en", "English"));
+                options.Languages.Add(new LanguageInfo("pt-BR", "pt-BR", "Português"));
                 options.Languages.Add(new LanguageInfo("fi", "fi", "Finnish"));
                 options.Languages.Add(new LanguageInfo("fr", "fr", "Français"));
                 options.Languages.Add(new LanguageInfo("hi", "hi", "Hindi", "in"));
diff --git a/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs b/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
index 547fce39a7..d866faa730 100644
--- a/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
+++ b/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
@@ -137,7 +137,7 @@ namespace Volo.Docs.Areas.Documents.TagHelpers
                     }
                     else if (node.LastSignificantUpdateTime != null && node.LastSignificantUpdateTime + TimeSpan.FromDays(14) > DateTime.Now)
                     {
-                        var updBadge = sb.Append("<span class='badge badge-light ml-2' title=\"").Append(_localizer["UpdatedExplanation"]).Append("\">").Append(_localizer["Upd"]).Append("</span>");
+                        var updBadge = sb.Append("<span class='badge badge-light ml-2' title=\"").Append(_localizer["UpdatedExplanation"]).Append("\">").Append(_localizer["Upd"]).Append("</span>").ToString();
                         badgeStringBuilder.Append(updBadge);
                     }
                 }
@@ -147,7 +147,7 @@ namespace Volo.Docs.Areas.Documents.TagHelpers
                 listInnerItem = string.Format(ListItemAnchor, NormalizePath(node.Path), textCss,
                     node.Text.IsNullOrEmpty()
                         ? "?"
-                        : sb.Append(node.Text).Append(badgeStringBuilder).ToString());
+                        : sb.Append(node.Text).Append(badgeStringBuilder.ToString()).ToString());
             }
 
             sb.Clear();
diff --git a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs
index d50d1b307b..99c323bf89 100644
--- a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs
+++ b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs
@@ -212,7 +212,7 @@ namespace Volo.Docs.Pages.Documents.Project
             var sb = new StringBuilder();
 
             var returnUrl = sb.Append(DocumentsUrlPrefix).Append(LanguageCode).Append("/").Append(ProjectName)
-                .Append("/").Append(LatestVersionInfo.IsSelected ? DocsAppConsts.Latest : Version).Append("/").Append(DocumentName);
+                .Append("/").Append(LatestVersionInfo.IsSelected ? DocsAppConsts.Latest : Version).Append("/").Append(DocumentName).ToString();
 
             sb.Clear();
             
@@ -454,6 +454,8 @@ namespace Volo.Docs.Pages.Documents.Project
                         language.Code == LanguageCode
                         )
                     );
+
+                sb.Clear();
             }
         }