never mind I found the answer

using System.Windows.Forms;
using Infragistics.Excel;

// Create a workbook with a worksheet
Workbook workbook = new Workbook();
Worksheet worksheet1 = workbook.Worksheets.Add( "Sheet1" );

// Create an image shape which can be placed on a worksheet
Image image1 = Image.FromFile( "C:\\image1.bmp" );
WorksheetImage imageShape1 = new WorksheetImage( image1 );

// The top-left corner of the image shape will be in the middle of cell A1
imageShape1.TopLeftCornerCell = worksheet1.Rows[ 0 ].Cells[ 0 ];
imageShape1.TopLeftCornerPosition = new PointF( 50, 50 );

// The bottom-right corner of the image shape will be in the middle of cell B2
imageShape1.BottomRightCornerCell = worksheet1.Rows[ 1 ].Cells[ 1 ];
imageShape1.BottomRightCornerPosition = new PointF( 50, 50 );

// Create another image shape which can be placed on a worksheet
Image image2 = Image.FromFile( "C:\\image2.bmp" );
WorksheetImage imageShape2 = new WorksheetImage( image2 );

// Get the bounds of cell C3
Rectangle cellC3Bounds = worksheet1.Rows[ 2 ].Cells[ 2 ].GetBoundsInTwips();

// Place the second image shape in the same bounds as cell C3
imageShape2.SetBoundsInTwips( worksheet1, cellC3Bounds );

// Create a group which will hold both images
WorksheetShapeGroup group = new WorksheetShapeGroup();

// Place both images in the group
group.Shapes.Add( imageShape1 );
group.Shapes.Add( imageShape2 );

// Place the group on the worksheet
worksheet1.Shapes.Add( group );