diff --git a/ScrumTaskboard/Controllers/CategoriesController.cs b/ScrumTaskboard/Controllers/CategoriesController.cs
index 109c22b..fe8b803 100644
--- a/ScrumTaskboard/Controllers/CategoriesController.cs
+++ b/ScrumTaskboard/Controllers/CategoriesController.cs
@@ -20,21 +20,21 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/category
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumCategory>>> GetCategory()
+        public async Task<ActionResult<IEnumerable<ScrumCategory>>> GetCategory([FromQuery]string? title, [FromQuery]int? projectid, [FromQuery] string? color)
         {
             var filtered = _context.Categories.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumCategory>(c => c.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumCategory>(c => c.title.Contains(title));
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["projectid"]) != 0)
+            if (projectid != null)
             {
-                filtered = filtered.Where<ScrumCategory>(c => c.projectid == Convert.ToInt32(HttpContext.Request.Query["projectid"]));
+                filtered = filtered.Where<ScrumCategory>(c => c.projectid == projectid);
             }
-            if (HttpContext.Request.Query["color"].ToString() != "")
+            if (color != null)
             {
-                filtered = filtered.Where<ScrumCategory>(c => c.color == HttpContext.Request.Query["color"].ToString());
+                filtered = filtered.Where<ScrumCategory>(c => c.color == color);
 
             }
 
diff --git a/ScrumTaskboard/Controllers/ProjectsController.cs b/ScrumTaskboard/Controllers/ProjectsController.cs
index 8149449..64955e5 100644
--- a/ScrumTaskboard/Controllers/ProjectsController.cs
+++ b/ScrumTaskboard/Controllers/ProjectsController.cs
@@ -20,17 +20,17 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/projects
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumProject>>> GetProject()
+        public async Task<ActionResult<IEnumerable<ScrumProject>>> GetProject([FromQuery]string? title, [FromQuery]bool? isprivate)
         {
             var filtered = _context.Projects.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumProject>(t => t.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumProject>(t => t.title.Contains(title));
             }
-            if (HttpContext.Request.Query["isprivate"].ToString() != "")
+            if (isprivate != null)
             {
-                filtered = filtered.Where<ScrumProject>(t => t.isprivate == Convert.ToBoolean(HttpContext.Request.Query["isprivate"]));
+                filtered = filtered.Where<ScrumProject>(t => t.isprivate == isprivate);
             }
 
             return await filtered.ToListAsync();
diff --git a/ScrumTaskboard/Controllers/SprintsController.cs b/ScrumTaskboard/Controllers/SprintsController.cs
index 2144fcf..043527c 100644
--- a/ScrumTaskboard/Controllers/SprintsController.cs
+++ b/ScrumTaskboard/Controllers/SprintsController.cs
@@ -20,25 +20,25 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/sprint
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumSprint>>> GetSprint()
+        public async Task<ActionResult<IEnumerable<ScrumSprint>>> GetSprint([FromQuery]string? title, [FromQuery]int? projectid, [FromQuery]DateTime? startDate, [FromQuery]DateTime? endDate)
         {
             var filtered = _context.Sprints.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumSprint>(s => s.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumSprint>(s => s.title.Contains(title));
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["projectid"]) != 0)
+            if (projectid != null)
             {
-                filtered = filtered.Where<ScrumSprint>(s => s.projectid == Convert.ToInt32(HttpContext.Request.Query["projectid"]));
+                filtered = filtered.Where<ScrumSprint>(s => s.projectid == projectid);
             }
-            if (HttpContext.Request.Query["startDate"].ToString() != "")
+            if (startDate != null)
             {
-                filtered = filtered.Where<ScrumSprint>(s => s.startDate == DateTime.Parse(HttpContext.Request.Query["startDate"].ToString()));
+                filtered = filtered.Where<ScrumSprint>(s => s.startDate == startDate);
             }
-            if (HttpContext.Request.Query["endDate"].ToString() != "")
+            if (endDate != null)
             {
-                filtered = filtered.Where<ScrumSprint>(s => s.endDate == DateTime.Parse(HttpContext.Request.Query["startDate"].ToString()));
+                filtered = filtered.Where<ScrumSprint>(s => s.endDate == endDate);
             }
 
             return await filtered.ToListAsync();
diff --git a/ScrumTaskboard/Controllers/StatusController.cs b/ScrumTaskboard/Controllers/StatusController.cs
index 518e920..95f345e 100644
--- a/ScrumTaskboard/Controllers/StatusController.cs
+++ b/ScrumTaskboard/Controllers/StatusController.cs
@@ -19,13 +19,13 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/status
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumStatus>>> GetStatus()
+        public async Task<ActionResult<IEnumerable<ScrumStatus>>> GetStatus([FromQuery]string? title)
         {
             var filtered = _context.Status.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumStatus>(s => s.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumStatus>(s => s.title.Contains(title));
             }
 
             return await filtered.ToListAsync();
diff --git a/ScrumTaskboard/Controllers/TasksController.cs b/ScrumTaskboard/Controllers/TasksController.cs
index 5859d44..3cfb6f8 100644
--- a/ScrumTaskboard/Controllers/TasksController.cs
+++ b/ScrumTaskboard/Controllers/TasksController.cs
@@ -20,38 +20,36 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/tasks
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumTask>>> GetTasks()
+        public async Task<ActionResult<IEnumerable<ScrumTask>>> GetTasks([FromQuery]string? title, [FromQuery]int? userstoryid, [FromQuery]int? statusid, [FromQuery]int? categoryid, [FromQuery]int? assignedtoid, [FromQuery]int? projectid, [FromQuery]ScrumPrio? priority)
         {
             var filtered = _context.Tasks.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumTask>(t => t.title.Contains(title));
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["userstoryid"]) != 0)
+            if (userstoryid != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.userstoryid == Convert.ToInt32(HttpContext.Request.Query["userstoryid"]));
+                filtered = filtered.Where<ScrumTask>(t => t.userstoryid == userstoryid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["statusid"]) != 0)
+            if (statusid != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.statusid == Convert.ToInt32(HttpContext.Request.Query["statusid"]));
+                filtered = filtered.Where<ScrumTask>(t => t.statusid == statusid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["categoryid"]) != 0)
+            if (categoryid != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.categoryid == Convert.ToInt32(HttpContext.Request.Query["categoryid"]));
+                filtered = filtered.Where<ScrumTask>(t => t.categoryid == categoryid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["assignedtoid"]) != 0)
+            if (assignedtoid != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.assignedtoid == Convert.ToInt32(HttpContext.Request.Query["assignedtoid"]));
+                filtered = filtered.Where<ScrumTask>(t => t.assignedtoid == assignedtoid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["projectid"]) != 0)
+            if (projectid != null)
             {
-                filtered = filtered.Where<ScrumTask>(t => t.projectid == Convert.ToInt32(HttpContext.Request.Query["projectid"]));
+                filtered = filtered.Where<ScrumTask>(t => t.projectid == projectid);
             }
-            if (HttpContext.Request.Query["priority"].ToString() != "")
+            if (priority != null)
             {
-                ScrumPrio priority;
-                Enum.TryParse<ScrumPrio>(HttpContext.Request.Query["priority"].ToString(), out priority);
                 filtered = filtered.Where<ScrumTask>(t => t.priority == priority);
             }
 
diff --git a/ScrumTaskboard/Controllers/UsersController.cs b/ScrumTaskboard/Controllers/UsersController.cs
index a8d4b7c..ddda017 100644
--- a/ScrumTaskboard/Controllers/UsersController.cs
+++ b/ScrumTaskboard/Controllers/UsersController.cs
@@ -19,12 +19,12 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/sprint
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumUser>>> GetUser()
+        public async Task<ActionResult<IEnumerable<ScrumUser>>> GetUser([FromQuery]string? name)
         {
             var filtered = _context.Users.AsQueryable();
-            if (HttpContext.Request.Query["name"].ToString() != "")
+            if (name != null)
             {
-                filtered = filtered.Where<ScrumUser>(u => u.name.Contains(HttpContext.Request.Query["name"].ToString()));
+                filtered = filtered.Where<ScrumUser>(u => u.name.Contains(name));
             }
 
             return await filtered.ToListAsync();
diff --git a/ScrumTaskboard/Controllers/UserstoriesController.cs b/ScrumTaskboard/Controllers/UserstoriesController.cs
index 861b449..ff2eadb 100644
--- a/ScrumTaskboard/Controllers/UserstoriesController.cs
+++ b/ScrumTaskboard/Controllers/UserstoriesController.cs
@@ -20,38 +20,36 @@ namespace ScrumTaskboard.Controllers
 
         // GET: api/userstories
         [HttpGet]
-        public async Task<ActionResult<IEnumerable<ScrumUserstory>>> GetUserstory()
+        public async Task<ActionResult<IEnumerable<ScrumUserstory>>> GetUserstory([FromQuery]string? title, [FromQuery]int? statusid, [FromQuery]int? categoryid, [FromQuery]int? createdbyid, [FromQuery]int? projectid, [FromQuery]int? sprintid, [FromQuery]ScrumPrio? priority)
         {
             var filtered = _context.Userstories.AsQueryable();
 
-            if (HttpContext.Request.Query["title"].ToString() != "")
+            if (title != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.title.Contains(HttpContext.Request.Query["title"].ToString()));
+                filtered = filtered.Where<ScrumUserstory>(t => t.title.Contains(title));
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["statusid"]) != 0)
+            if (statusid != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.statusid == Convert.ToInt32(HttpContext.Request.Query["statusid"]));
+                filtered = filtered.Where<ScrumUserstory>(t => t.statusid == statusid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["categoryid"]) != 0)
+            if (categoryid != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.categoryid == Convert.ToInt32(HttpContext.Request.Query["categoryid"]));
+                filtered = filtered.Where<ScrumUserstory>(t => t.categoryid == categoryid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["createdby"]) != 0)
+            if (createdbyid != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.createdbyid == Convert.ToInt32(HttpContext.Request.Query["createdby"]));
+                filtered = filtered.Where<ScrumUserstory>(t => t.createdbyid == createdbyid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["projectid"]) != 0)
+            if (projectid != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.projectid == Convert.ToInt32(HttpContext.Request.Query["projectid"]));
+                filtered = filtered.Where<ScrumUserstory>(t => t.projectid == projectid);
             }
-            if (Convert.ToInt32(HttpContext.Request.Query["sprintid"]) != 0)
+            if (sprintid != null)
             {
-                filtered = filtered.Where<ScrumUserstory>(t => t.sprintid == Convert.ToInt32(HttpContext.Request.Query["sprintid"]));
+                filtered = filtered.Where<ScrumUserstory>(t => t.sprintid == sprintid);
             }
-            if (HttpContext.Request.Query["priority"].ToString() != "")
+            if (priority != null)
             {
-                ScrumPrio priority;
-                Enum.TryParse<ScrumPrio>(HttpContext.Request.Query["priority"].ToString(), out priority);
                 filtered = filtered.Where<ScrumUserstory>(t => t.priority == priority);
             }