Updated the Sample

src/EPPlus.Core.SampleWebApp/Controllers/HomeController.cs

@@ -86,7 +86,8 @@ public async Task<IActionResult> FileUpload(IFormFile file)
 
                 using (var package = new ExcelPackage(memoryStream))
                 {
-                    return Content(readExcelPackageToString(package, worksheetName: "Employee"));
+                    var worksheet = package.Workbook.Worksheets[1]; // Tip: To access the first worksheet, try index 1, not 0
+                    return Content(readExcelPackageToString(package, worksheet));
                 }
             }
         }
@@ -95,13 +96,12 @@ private string readExcelPackage(FileInfo fileInfo, string worksheetName)
         {
             using (var package = new ExcelPackage(fileInfo))
             {
-                return readExcelPackageToString(package, worksheetName);
+                return readExcelPackageToString(package, package.Workbook.Worksheets[worksheetName]);
             }
         }
 
-        private string readExcelPackageToString(ExcelPackage package, string worksheetName)
+        private string readExcelPackageToString(ExcelPackage package, ExcelWorksheet worksheet)
         {
-            var worksheet = package.Workbook.Worksheets[worksheetName]; // Tip: To access the first worksheet, try index 1, not 0 -> package.Workbook.Worksheets[1]
             int rowCount = worksheet.Dimension.Rows;
             int ColCount = worksheet.Dimension.Columns;
 

src/EPPlus.Core.SampleWebApp/Views/Home/Index.cshtml

@@ -1,20 +1,20 @@
-<fieldset> 
+<fieldset>
    <legend>Basic usage</legend>
     <ul>
         <li>
-            <a asp-action="InMemoryReport" asp-controller="Home">Create an in-memory report</a>  
-        </li>  
+            <a asp-action="InMemoryReport" asp-controller="Home">Create an in-memory report</a>
+        </li>
         <li>
-            <a asp-action="FileReport" asp-controller="Home">Create a file report</a>  
-        </li>          
+            <a asp-action="FileReport" asp-controller="Home">Create a file report</a>
+        </li>
         <li>
-            <a asp-action="ReadFile" asp-controller="Home">Read report.xlsx file</a>  
-        </li>                  
+            <a asp-action="ReadFile" asp-controller="Home">Read report.xlsx file</a>
+        </li>
     </ul>
 </fieldset>
 
-<fieldset style="margin-top: 15px"> 
-   <legend>Upload the above report.xlsx file</legend>
+<fieldset style="margin-top: 15px">
+   <legend>Upload an xlsx file</legend>
    <form method="post"
          asp-action="FileUpload"
          asp-controller="Home"