Visual Basic - Saving textbox to Excel file - excel

Question

I would like to setup a webpage that users can paste work orders into a textbox, click submit, and it writes it to .xlsx on a server.
I've gotten StreamWriter to save it to a .txt, but doesn't work/isn't compatible with .xlsx.
Could someone point me in the right direction? I'm not looking for someone to do it for me, but I am new to coding, so I've got tons of stupid questions.

Answer 1

If you had the users input the work orders into a datagrid instead of a textbox, your export to excel would be easier and look better.
Function EXPTOEXLS()
Dim rowsTotal, colsTotal As Short
Dim I, j, iC As Short
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor
Dim xlApp As New Excel.Application 'need to add reference to "Microsoft Excel xx object library" then add | IMPORTS microsoft.office.interop (add to top)
Try
Dim excelBook As Excel.Workbook = xlApp.Workbooks.Add
Dim excelWorksheet As Excel.Worksheet = CType(excelBook.Worksheets(1), Excel.Worksheet)
xlApp.Visible = True
rowsTotal = DataGridView1.RowCount - 1
colsTotal = DataGridView1.Columns.Count - 1
With excelWorksheet
.Cells.Select()
.Cells.Delete()
For iC = 0 To colsTotal
.Cells(1, iC + 1).Value = DataGridView1.Columns(iC).HeaderText
Next
For I = 0 To rowsTotal
For j = 0 To colsTotal
.Cells(I + 2, j + 1).value = DataGridView1.Rows(I).Cells(j).Value
Next j
Next I
.Rows("1:1").Font.FontStyle = "Bold"
.Rows("1:1").Font.Size = 10
.Cells.Columns.AutoFit()
.Cells.Select()
.Cells.EntireColumn.AutoFit()
.Cells(1, 1).Select()
End With
Catch ex As Exception
MsgBox(ex.Message)
Finally
'RELEASE ALLOACTED RESOURCES
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default
xlApp = Nothing
End Try
End Function