diff --git a/csharp/0263-ugly-number.cs b/csharp/0263-ugly-number.cs
new file mode 100644
index 000000000..123c1cb1b
--- /dev/null
+++ b/csharp/0263-ugly-number.cs
@@ -0,0 +1,32 @@
+public class Solution
+{
+    public bool IsUgly(int n)
+    {
+        while (n != 0)
+        {
+            if (n == 1)
+            {
+                return true;
+            }
+
+            if (n % 2 == 0)
+            {
+                n /= 2;
+            }
+            else if (n % 3 == 0)
+            {
+                n /= 3;
+            }
+            else if (n % 5 == 0)
+            {
+                n /= 5;
+            }
+            else
+            {
+                break;
+            }
+        }
+
+        return false;
+    }
+}
\ No newline at end of file