Add more errors

src/Managing.Api/Controllers/DataController.cs

@@ -47,6 +47,7 @@ public class DataController : ControllerBase
     /// <param name="accountService">Service for account management.</param>
     /// <param name="cacheService">Service for caching data.</param>
     /// <param name="statisticService">Service for statistical analysis.</param>
+    /// <param name="agentService">Service for agents</param>
     /// <param name="hubContext">SignalR hub context for real-time communication.</param>
     /// <param name="mediator">Mediator for handling commands and queries.</param>
     /// <param name="tradingService">Service for trading operations.</param>
@@ -451,6 +452,11 @@ public class DataController : ControllerBase
     [HttpGet("GetUserStrategies")]
     public async Task<ActionResult<List<UserStrategyDetailsViewModel>>> GetUserStrategies(string agentName)
     {
+        if (string.IsNullOrEmpty(agentName))
+        {
+            return BadRequest("Agent name cannot be null or empty.");
+        }
+
         // Get all strategies for the specified user
         var userStrategies = await _mediator.Send(new GetUserStrategiesCommand(agentName));
 
@@ -476,6 +482,16 @@ public class DataController : ControllerBase
     [HttpGet("GetUserStrategy")]
     public async Task<ActionResult<UserStrategyDetailsViewModel>> GetUserStrategy(string agentName, string strategyName)
     {
+        if (string.IsNullOrEmpty(agentName))
+        {
+            return BadRequest("Agent name cannot be null or empty.");
+        }
+
+        if (string.IsNullOrEmpty(strategyName))
+        {
+            return BadRequest("Strategy name cannot be null or empty.");
+        }
+
         // Get the specific strategy for the user
         var strategy = await _mediator.Send(new GetUserStrategyCommand(agentName, strategyName));