# STIsClosed (geometry Data Type)

**THIS TOPIC APPLIES TO:**SQL Server (starting with 2008)Azure SQL DatabaseAzure SQL Data Warehouse Parallel Data Warehouse

Returns 1 if the start and end points of the given **geometry** instance are the same. Returns 1 for **geometrycollection** types if each contained **geometry** instance is closed. Returns 0 if the instance is not closed.

## Syntax

```
.STIsClosed ( )
```

## Return Types

SQL Server return type: **bit**

CLR return type: **SqlBoolean**

## Remarks

This method returns 0 if any figures of a **geometry** instance are points, or if the instance is empty.

All **Polygon** instances are considered closed.

## Examples

The following example creates a `LineString`

instance and uses `STIsClosed()`

to test if the `LineString`

is closed.

```
DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0);
SELECT @g.STIsClosed();
```