## Workbook.StartAccessCache method

Starts the session that uses caches to access data.

```csharp
public void StartAccessCache(AccessCacheOptions opts)
```

| Parameter | Type | Description |
| --- | --- | --- |
| opts | AccessCacheOptions | options of data access |

### Remarks

If the cache of specified data access requires some data models in worksheet to be "read-only", then corresponding data models in every worksheet in this workbook will be taken as "read-only" and user should not change any of them.  After finishing the access to the data, [`CloseAccessCache`](../closeaccesscache/) should be invoked with same options to clear all caches and recover normal access mode.

### Examples

```csharp
using System;
using System.Drawing;
using System.IO;
using Aspose.Cells;

namespace AsposeCellsExamples
{
    public class WorkbookMethodStartAccessCacheWithAccessCacheOptionsDemo
    {
        public static void Run()
        {
            // Create a workbook
            Workbook wb = new Workbook();
            Worksheet sheet = wb.Worksheets[0];
            
            // Add conditional formatting
            ConditionalFormattingCollection cfc = sheet.ConditionalFormattings;
            int index = cfc.Add();
            cfc[index].Add(CellArea.CreateCellArea(0, 0, 5, 0),
                FormatConditionType.DuplicateValues, OperatorType.None, null, null);
            
            // Set style for conditional formatting
            Style style = cfc[0][0].Style;
            style.ForegroundColor = Color.Red;
            style.Pattern = BackgroundType.Solid;
            
            // Add some embedded images
            Cells cells = sheet.Cells;
            byte[] img1 = File.ReadAllBytes("1.png");
            byte[] img2 = File.ReadAllBytes("2.png");
            cells[0, 0].EmbeddedImage = img1;
            cells[2, 0].EmbeddedImage = img2;
            cells[4, 0].EmbeddedImage = img1;

            // Start access cache for better performance
            wb.StartAccessCache(AccessCacheOptions.All);
            
            // Access cell styles (will be faster due to caching)
            Console.WriteLine("A1 Pattern: " + cells[0, 0].GetDisplayStyle().Pattern);
            Console.WriteLine("A3 Pattern: " + cells[2, 0].GetDisplayStyle().Pattern);
            Console.WriteLine("A5 Pattern: " + cells[4, 0].GetDisplayStyle().Pattern);
            
            // Close the cache when done
            wb.CloseAccessCache(AccessCacheOptions.All);
        }
    }
}
```

### See Also

* enum [AccessCacheOptions](../../accesscacheoptions/)
* class [Workbook](../)
* namespace [Aspose.Cells](../../../aspose.cells/)
* assembly [Aspose.Cells](../../../)