Converts all letters in a text string to lowercase.
| Name | Type | Description |
| arg1 | string | The text to convert to lowercase. The text characters that are not letters are not changed. |
builder.CreateFile("xlsx");
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.LOWER("Day"));
builder.SaveFile("xlsx", "LOWER.xlsx");
builder.CloseFile();