Worksheets not save at server directory

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C#

I converted datatable into excel format.This is working properly with local system but not working with server..file is not save at server location.

I apply full security but still unable to save excel file at server location.

Please,suggests that how can I save excel file on server location.

var workbook2 = new ExcelFile();

// Imports all tables from DataSet to new file.
foreach (DataTable dataTable in dataSet.Tables)
{
// Add new worksheet to the file.
var worksheet = workbook2.Worksheets.Add(dataTable.TableName);

// Change the value of the first cell in the DataTable.
dataTable.Rows[0][0] = "This is new file!";

// Insert the data from DataTable to the worksheet starting at cell "A1".
worksheet.InsertDataTable(dataTable,
new InsertDataTableOptions("A1") { ColumnHeaders = true });
}

What I have tried:

var workbook2 = new ExcelFile();

// Imports all tables from DataSet to new file.
foreach (DataTable dataTable in dataSet.Tables)
{
// Add new worksheet to the file.
var worksheet = workbook2.Worksheets.Add(dataTable.TableName);

// Change the value of the first cell in the DataTable.
dataTable.Rows[0][0] = "This is new file!";

// Insert the data from DataTable to the worksheet starting at cell "A1".
worksheet.InsertDataTable(dataTable,
new InsertDataTableOptions("A1") { ColumnHeaders = true });
}