# STIsClosed (geometry Data Type)

Returns 1 if the start and end points of the given geometry instance are the same. Returns 1 for geometry collection 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();
```