diff --git a/src/UI/DataGrid/Column.php b/src/UI/DataGrid/Column.php
index 893fb4a..29120f4 100644
--- a/src/UI/DataGrid/Column.php
+++ b/src/UI/DataGrid/Column.php
@@ -12,10 +12,9 @@ public function __construct(public string $name, public string $label, private D
 	}
 
 	/**
-	 * @phpstan-param DataGrid::Order*|null $defaultOrder
 	 * @return $this
 	 */
-	public function enableSort(string|null $defaultOrder = null): self
+	public function enableSort(ColumnOrder|null $defaultOrder = null): self
 	{
 		$this->sort = true;
 		if ($defaultOrder !== null) {
@@ -31,27 +30,27 @@ public function canSort(): bool
 		return $this->sort;
 	}
 
-	public function getNewState(): string
+	public function getNewState(): ColumnOrder
 	{
 		if ($this->isAsc()) {
-			return DataGrid::OrderDesc;
+			return ColumnOrder::Desc;
 		}
 
 		if ($this->isDesc()) {
-			return '';
+			return ColumnOrder::Undefined;
 		}
 
-		return DataGrid::OrderAsc;
+		return ColumnOrder::Asc;
 	}
 
 	public function isAsc(): bool
 	{
-		return $this->grid->orderColumn === $this->name && $this->grid->orderType === DataGrid::OrderAsc;
+		return $this->grid->orderColumn === $this->name && $this->grid->orderType === ColumnOrder::Asc;
 	}
 
 	public function isDesc(): bool
 	{
-		return $this->grid->orderColumn === $this->name && $this->grid->orderType === DataGrid::OrderDesc;
+		return $this->grid->orderColumn === $this->name && $this->grid->orderType === ColumnOrder::Desc;
 	}
 
 }
diff --git a/src/UI/DataGrid/ColumnOrder.php b/src/UI/DataGrid/ColumnOrder.php
new file mode 100644
index 0000000..e522c39
--- /dev/null
+++ b/src/UI/DataGrid/ColumnOrder.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types = 1);
+
+namespace OriCMF\UI\DataGrid;
+
+enum ColumnOrder: string
+{
+
+	case Asc = 'asc';
+
+	case Desc = 'desc';
+
+	case Undefined = 'undefined';
+
+}
diff --git a/src/UI/DataGrid/DataGrid.php b/src/UI/DataGrid/DataGrid.php
index d055b1b..e50e3a3 100644
--- a/src/UI/DataGrid/DataGrid.php
+++ b/src/UI/DataGrid/DataGrid.php
@@ -27,9 +27,6 @@
 final class DataGrid extends BaseControl
 {
 
-	public const OrderAsc = 'asc',
-		OrderDesc = 'desc';
-
 	public const TemplatePath = __DIR__ . '/DataGrid.latte';
 
 	/** @var array<string, mixed> */
@@ -39,9 +36,8 @@ final class DataGrid extends BaseControl
 	#[Persistent]
 	public string|null $orderColumn = null;
 
-	/** @var self::Order* */
 	#[Persistent]
-	public string $orderType = self::OrderAsc;
+	public ColumnOrder $orderType = ColumnOrder::Undefined;
 
 	/** @var int<1, max> */
 	#[Persistent]
diff --git a/src/UI/DataGrid/OrderParameter.php b/src/UI/DataGrid/OrderParameter.php
index dfbfa43..ebc73bd 100644
--- a/src/UI/DataGrid/OrderParameter.php
+++ b/src/UI/DataGrid/OrderParameter.php
@@ -5,15 +5,11 @@
 final class OrderParameter
 {
 
-	/** @phpstan-var DataGrid::Order* */
-	private string $direction;
-
-	/**
-	 * @phpstan-param DataGrid::Order* $direction
-	 */
-	public function __construct(private readonly string $column, string $direction)
+	public function __construct(
+		private readonly string $column,
+		private readonly ColumnOrder $order,
+	)
 	{
-		$this->direction = $direction;
 	}
 
 	public function getColumn(): string
@@ -21,22 +17,19 @@ public function getColumn(): string
 		return $this->column;
 	}
 
-	/**
-	 * @phpstan-return DataGrid::Order*
-	 */
-	public function getDirection(): string
+	public function getOrder(): ColumnOrder
 	{
-		return $this->direction;
+		return $this->order;
 	}
 
 	public function isAsc(): bool
 	{
-		return $this->direction === DataGrid::OrderAsc;
+		return $this->order === ColumnOrder::Asc;
 	}
 
 	public function isDesc(): bool
 	{
-		return $this->direction === DataGrid::OrderDesc;
+		return $this->order === ColumnOrder::Desc;
 	}
 
 }