SQL Table in CSV file shows NULL Rows as " " in Excel - sql

Question

Basically, I am displaying an SQL table in my VB.NET gridview, once its in my gridview, I then have a button that exports the results from visual studio into a CSV file, Everything in the CSV file looks fine, except any cell that is NULL in the SQL table now displays as:
I tried to fix this in a stored procedure using the code bellow:
UPDATE EmailManagementTable
SET Excluded = ''
WHERE Excluded IS NULL
But even with this code I still get the same problem.
This is my Code for the Button that exports the gridview results to CSV:
Response.Clear()
Response.Buffer = True
Response.AddHeader("content-disposition", "attachment;filename=gvtocsv.csv")
Response.Charset = ""
Response.ContentType = "application/text"
Dim sBuilder As StringBuilder = New System.Text.StringBuilder()
For index As Integer = 0 To GridView1.Columns.Count - 1
sBuilder.Append(GridView1.Columns(index).HeaderText + ","c)
Next
sBuilder.Append(vbCr & vbLf)
For i As Integer = 0 To GridView1.Rows.Count - 1
For k As Integer = 0 To GridView1.HeaderRow.Cells.Count - 1
sBuilder.Append(GridView1.Rows(i).Cells(k).Text.Replace(",", "") + ",")
Next
sBuilder.Append(vbCr & vbLf)
Next
Response.Output.Write(sBuilder.ToString())
Response.Flush()
Response.[End]()
I was wondering if I could get some assistance with this?
Thankyou in advance

Answer 1

I solved my problem!
I edited some code inside my Export Button, Here's the code:
Response.Clear()
Response.Buffer = True
Response.AddHeader("content-disposition", "attachment;filename=gvtocsv.csv")
Response.Charset = ""
Response.ContentType = "application/text"
Dim sBuilder As StringBuilder = New System.Text.StringBuilder()
For index As Integer = 0 To GridView1.Columns.Count - 1
sBuilder.Append(GridView1.Columns(index).HeaderText + ","c)
Next
sBuilder.Append(vbCr & vbLf)
For i As Integer = 0 To GridView1.Rows.Count - 1
For k As Integer = 0 To GridView1.HeaderRow.Cells.Count - 1
sBuilder.Append(GridView1.Rows(i).Cells(k).Text.Replace(",", "").Replace(" ", "") + ",")
Next
sBuilder.Append(vbCr & vbLf)
Next
Response.Output.Write(sBuilder.ToString())
Response.Flush()
Response.[End]()