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1 files changed, 62 insertions, 0 deletions

diff --git a/Emails.Transactional.Client/Exceptions/ValidationFailedException.cs b/Emails.Transactional.Client/Exceptions/ValidationFailedException.cs
new file mode 100644
index 0000000..12bcc33
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+++ b/Emails.Transactional.Client/Exceptions/ValidationFailedException.cs
@@ -0,0 +1,62 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Text;
+
+#nullable enable
+
+namespace Emails.Transactional.Client.Exceptions
+{
+    /// <summary>
+    /// Raised when server message validation failed
+    /// </summary>
+    public class ValidationFailedException : InvalidTransactionRequestException
+    {
+        ///<inheritdoc/>
+        public ValidationFailedException()
+        {}
+        ///<inheritdoc/>
+        public ValidationFailedException(string message) : base(message)
+        {}
+        ///<inheritdoc/>
+        public ValidationFailedException(string message, Exception innerException) : base(message, innerException)
+        {}
+
+        /// <summary>
+        /// A collection of validaion error messages
+        /// </summary>
+        public ICollection<ValidationErrorMessage>? ValidationErrors { get; init; }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="result"></param>
+        public ValidationFailedException(TransactionResult result):base("Transaction data server validation failed")
+        {
+            this.ValidationErrors = result?.ValidationErrors;
+        }
+
+        ///<inheritdoc/>
+        public override string Message
+        {
+            get
+            {
+                if(ValidationErrors == null)
+                {
+                    return base.Message;
+
+                }
+                StringBuilder sb = new(base.Message);
+                sb.AppendLine();
+                
+                foreach(var kvp in ValidationErrors)
+                {
+                    sb.Append("Validation error: ");
+                    sb.Append(kvp.PropertyName);
+                    sb.Append(' ');
+                    sb.AppendLine(kvp.ErrorMessage);
+                }
+                return sb.ToString();
+            }
+        }
+    }
+}