Public ReadOnly Property Index As Integer

public int Index {get;}

Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinGrid
Imports System.Diagnostics

   Private Sub Button94_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button94.Click

       Dim columns As ColumnsCollection = Me.ultraGrid1.DisplayLayout.Bands(0).Columns

       ' Loop through all the columns.
       Dim i As Integer
       For i = 0 To columns.Count - 1
           Dim column As UltraGridColumn = columns(i)

           ' Write out the index and the key of the column.
           Debug.WriteLine("columns(" & i & ").Index = " & column.Index & ", Key = " & column.Key)
       Next

   End Sub

using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinGrid;
using System.Diagnostics;

private void button94_Click(object sender, System.EventArgs e)
{

	ColumnsCollection columns = this.ultraGrid1.DisplayLayout.Bands[0].Columns;

	// Loop through all the columns.
	for ( int i = 0; i < columns.Count; i++ )
	{
		UltraGridColumn column = columns[i];

		// Write out the index and the key of the column.
		Debug.WriteLine( "columns[" + i + "].Index = " + column.Index + ", Key = " + column.Key );
	}

}