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Spread WinForms provides the AutoSortOrder property, which allows you to sort fields in a pivot table in either ascending or descending order.
Additionally, you can use the AutoSortField property to specify or retrieve the name of the data field used for sorting.

Refer to the following example code to sort Category field in a pivot table.
C#
fpSpread1.BorderCollapse = BorderCollapse.Enhanced;
IWorkbook workbook = fpSpread1.AsWorkbook();
IWorksheet sheet1 = workbook.ActiveSheet;
// Set data.
sheet1.SetValue(0, 0, new object[,] {
{"OrderDate", "Region", "City", "Category", "Product", "Quantity"},
{"2025-07-01", "East", "Jersey", "Breads", "Bakery", 1120},
{"2025-07-01", "East", "Jersey", "Breads", "Cookie", 563},
{"2025-07-02", "East", "Washington, DC", "Breads", "Bakery", 1281},
{"2025-07-02", "East", "Washington, DC", "Breads", "Cookie", 546},
{"2025-07-01", "East", "Jersey", "Beverages", "Coffee", 326},
{"2025-07-02", "East", "Washington, DC", "Beverages", "Coffee", 205},
{"2025-07-02", "East", "Washington, DC", "Beverages", "Juice", 186},
{"2025-07-01", "West", "San Francisco", "Breads", "Bakery", 1262},
{"2025-07-01", "West", "San Francisco", "Breads", "Cookie", 349},
{"2025-07-01", "West", "Seattle", "Breads", "Bakery", 524},
{"2025-07-01", "West", "Seattle", "Breads", "Cookie", 196},
{"2025-07-01", "West", "San Francisco", "Beverages", "Coffee", 363},
{"2025-07-01", "West", "Seattle", "Beverages", "Coffee", 100},
{"2025-07-02", "East", "Jersey", "Beverages", "Juice", 120},
{"2025-07-02", "West", "San Francisco", "Breads", "Bakery", 350},
{"2025-07-02", "West", "Seattle", "Beverages", "Tea", 180},
{"2025-07-02", "East", "Jersey", "Breads", "Cookie", 75},
{"2025-07-03", "West", "San Francisco", "Beverages", "Juice", 210},
{"2025-07-03", "East", "Boston", "Breads", "Bakery", 420}
});
IPivotCache pvCache = fpSpread1.AsWorkbook().PivotCaches.Create("Sheet1!A1:F20");
// Configure pivot table's fields.
IPivotTable pvTable = pvCache.CreatePivotTable(sheet1.Cells["I1"]);
IPivotFields pvFields = pvTable.PivotFields;
pvTable.AddDataField(pvFields["Quantity"], "Sum of quantity", ConsolidationFunction.Sum);
pvFields["Region"].Orientation = PivotFieldOrientation.Row;
pvFields["City"].Orientation = PivotFieldOrientation.Row;
pvFields["Category"].Orientation = PivotFieldOrientation.Column;
pvFields["Product"].Orientation = PivotFieldOrientation.Column;
pvFields["OrderDate"].Orientation = PivotFieldOrientation.Page;
// Set the sort order of the "Category" field to ascending.
pvFields["Category"].AutoSortOrder=FieldSortType.Ascending;VB
fpSpread1.BorderCollapse = BorderCollapse.Enhanced
Dim workbook As IWorkbook = fpSpread1.AsWorkbook()
Dim sheet1 As IWorksheet = workbook.ActiveSheet
' Set data.
sheet1.SetValue(0, 0, New Object(,) {
{"OrderDate", "Region", "City", "Category", "Product", "Quantity"},
{"2025-07-01", "East", "Jersey", "Breads", "Bakery", 1120},
{"2025-07-01", "East", "Jersey", "Breads", "Cookie", 563},
{"2025-07-02", "East", "Washington, DC", "Breads", "Bakery", 1281},
{"2025-07-02", "East", "Washington, DC", "Breads", "Cookie", 546},
{"2025-07-01", "East", "Jersey", "Beverages", "Coffee", 326},
{"2025-07-02", "East", "Washington, DC", "Beverages", "Coffee", 205},
{"2025-07-02", "East", "Washington, DC", "Beverages", "Juice", 186},
{"2025-07-01", "West", "San Francisco", "Breads", "Bakery", 1262},
{"2025-07-01", "West", "San Francisco", "Breads", "Cookie", 349},
{"2025-07-01", "West", "Seattle", "Breads", "Bakery", 524},
{"2025-07-01", "West", "Seattle", "Breads", "Cookie", 196},
{"2025-07-01", "West", "San Francisco", "Beverages", "Coffee", 363},
{"2025-07-01", "West", "Seattle", "Beverages", "Coffee", 100},
{"2025-07-02", "East", "Jersey", "Beverages", "Juice", 120},
{"2025-07-02", "West", "San Francisco", "Breads", "Bakery", 350},
{"2025-07-02", "West", "Seattle", "Beverages", "Tea", 180},
{"2025-07-02", "East", "Jersey", "Breads", "Cookie", 75},
{"2025-07-03", "West", "San Francisco", "Beverages", "Juice", 210},
{"2025-07-03", "East", "Boston", "Breads", "Bakery", 420}
})
Dim pvCache As IPivotCache = fpSpread1.AsWorkbook().PivotCaches.Create("Sheet1!A1:F20")
' Configure pivot table's fields.
Dim pvTable As IPivotTable = pvCache.CreatePivotTable(sheet1.Cells("I1"))
Dim pvFields As IPivotFields = pvTable.PivotFields
pvTable.AddDataField(pvFields("Quantity"), "Sum of quantity", ConsolidationFunction.Sum)
pvFields("Region").Orientation = PivotFieldOrientation.Row
pvFields("City").Orientation = PivotFieldOrientation.Row
pvFields("Category").Orientation = PivotFieldOrientation.Column
pvFields("Product").Orientation = PivotFieldOrientation.Column
pvFields("OrderDate").Orientation = PivotFieldOrientation.Page
' Set the sort order of the "Category" field to ascending.
pvFields("Category").AutoSortOrder = FieldSortType.Ascending