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To search for specific data in a range, worksheet or entire document, use the Range.Search, Worksheet.Search or Workbook.Search methods, respectively. To set options affecting search in a document, create an instance of the SearchOptions class and pass it as a parameter to the Search method. You can set the following advanced options.

Dim worksheet As Worksheet = workbook.Worksheets("ExpenseReport")
workbook.Worksheets.ActiveWorksheet = worksheet

' Specify the search term.
Dim searchString As String = Date.Today.ToString("d")

' Specify search options.
Dim options As New SearchOptions()
options.SearchBy = SearchBy.Columns
options.SearchIn = SearchIn.Values
options.MatchEntireCellContents = True

' Find all cells containing today's date and paint them light-green.
Dim searchResult As IEnumerable(Of Cell) = worksheet.Search(searchString, options)
For Each cell As Cell In searchResult
    cell.Fill.BackgroundColor = Color.LightGreen
Next cell

The image below shows the result of executing the code (the workbook is opened in Microsoft® Excel®). Today's date is located in the expense report and highlighted in light-green.