diff --git a/src/PhpSpreadsheet/Writer/BaseWriter.php b/src/PhpSpreadsheet/Writer/BaseWriter.php
index dc7a0431..afda5c43 100644
--- a/src/PhpSpreadsheet/Writer/BaseWriter.php
+++ b/src/PhpSpreadsheet/Writer/BaseWriter.php
@@ -108,9 +108,9 @@ abstract class BaseWriter implements IWriter
             return;
         }
 
-        $fileHandle = fopen($filename, 'wb+');
+        $fileHandle = $filename ? fopen($filename, 'wb+') : false;
         if ($fileHandle === false) {
-            throw new Exception('Could not open file ' . $filename . ' for writing.');
+            throw new Exception('Could not open file "' . $filename . '" for writing.');
         }
 
         $this->fileHandle = $fileHandle;
@@ -118,7 +118,7 @@ abstract class BaseWriter implements IWriter
     }
 
     /**
-     * Close file handle only we opened it ourselves.
+     * Close file handle only if we opened it ourselves.
      */
     protected function maybeCloseFileHandle(): void
     {
diff --git a/src/PhpSpreadsheet/Writer/Csv.php b/src/PhpSpreadsheet/Writer/Csv.php
index cabfe450..4344a5bd 100644
--- a/src/PhpSpreadsheet/Writer/Csv.php
+++ b/src/PhpSpreadsheet/Writer/Csv.php
@@ -4,7 +4,6 @@ namespace PhpOffice\PhpSpreadsheet\Writer;
 
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
-use PhpOffice\PhpSpreadsheet\Writer\Exception as WriterException;
 
 class Csv extends BaseWriter
 {
@@ -91,17 +90,7 @@ class Csv extends BaseWriter
         Calculation::setArrayReturnType(Calculation::RETURN_ARRAY_AS_VALUE);
 
         // Open file
-        if (is_resource($pFilename)) {
-            $fileHandle = $pFilename;
-        } elseif (!$pFilename) {
-            $fileHandle = false;
-        } else {
-            $fileHandle = fopen($pFilename, 'wb+');
-        }
-
-        if ($fileHandle === false) {
-            throw new WriterException("Could not open file $pFilename for writing.");
-        }
+        $this->openFileHandle($pFilename);
 
         if ($this->excelCompatibility) {
             $this->setUseBOM(true); //  Enforce UTF-8 BOM Header
@@ -110,13 +99,15 @@ class Csv extends BaseWriter
             $this->setDelimiter(';'); //  Set delimiter to a semi-colon
             $this->setLineEnding("\r\n");
         }
+
         if ($this->useBOM) {
             // Write the UTF-8 BOM code if required
-            fwrite($fileHandle, "\xEF\xBB\xBF");
+            fwrite($this->fileHandle, "\xEF\xBB\xBF");
         }
+
         if ($this->includeSeparatorLine) {
             // Write the separator line if required
-            fwrite($fileHandle, 'sep=' . $this->getDelimiter() . $this->lineEnding);
+            fwrite($this->fileHandle, 'sep=' . $this->getDelimiter() . $this->lineEnding);
         }
 
         //    Identify the range that we need to extract from the worksheet
@@ -128,9 +119,10 @@ class Csv extends BaseWriter
             // Convert the row to an array...
             $cellsArray = $sheet->rangeToArray('A' . $row . ':' . $maxCol . $row, '', $this->preCalculateFormulas);
             // ... and write to the file
-            $this->writeLine($fileHandle, $cellsArray[0]);
+            $this->writeLine($this->fileHandle, $cellsArray[0]);
         }
 
+        $this->maybeCloseFileHandle();
         Calculation::setArrayReturnType($saveArrayReturnType);
         Calculation::getInstance($this->spreadsheet)->getDebugLog()->setWriteDebugLog($saveDebugLog);
     }