ArcGIS Pro 2.6 API Reference Guide
CreateEnvelope(Double,Double,Double,Double,SpatialReference) Method
Example 

ArcGIS.Core.Geometry Namespace > EnvelopeBuilder Class > CreateEnvelope Method : CreateEnvelope(Double,Double,Double,Double,SpatialReference) Method
Lower left corner x value of the envelope.
Upper right corner y value of the envelope.
Lower left corner x value of the envelope.
Upper right corner y value of the envelope.
(Optional) The SpatialReference. The default value is null.
Convenience method to create a new instance of the Envelope class.
Syntax
Public Overloads Shared Function CreateEnvelope( _
   ByVal xMin As Double, _
   ByVal yMin As Double, _
   ByVal xMax As Double, _
   ByVal yMax As Double, _
   Optional ByVal spatialReference As SpatialReference _
) As Envelope

Parameters

xMin
Lower left corner x value of the envelope.
yMin
Upper right corner y value of the envelope.
xMax
Lower left corner x value of the envelope.
yMax
Upper right corner y value of the envelope.
spatialReference
(Optional) The SpatialReference. The default value is null.

Return Value

Remarks
The envelope is normalized to ensure XMin <= XMax, YMin <= yMax. If any of the xy-coordinate values are NaN, then the envelope is set to empty.
Example
Envelope env1 = EnvelopeBuilder.CreateEnvelope(0, 0, 1, 1, SpatialReferences.WGS84);
Envelope env2 = EnvelopeBuilder.CreateEnvelope(0.5, 0.5, 1.5, 1.5, SpatialReferences.WGS84);

Envelope env3 = env1.Union(env2);

double area = env3.Area;
double depth = env3.Depth;
double height = env3.Height;
double width = env3.Width;
double len = env3.Length;

MapPoint centerPt = env3.Center;
Coordinate2D coord = env3.CenterCoordinate;

bool isEmpty = env3.IsEmpty;
int pointCount = env3.PointCount;

// coordinates
//env3.XMin, env3.XMax, env3.YMin, env3.YMax
//env3.ZMin, env3.ZMax, env3.MMin, env3.MMax

bool isEqual = env1.IsEqual(env2);    // false
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

EnvelopeBuilder Class
EnvelopeBuilder Members
Overload List