Weird issue with saving to SQL database - vb.net

Question

I have managed to create a connection to the database and am able to save information to it from my form, the form contains 22 textboxes, a save and another exit button.
I have set the form to retrieve data in the form_load. I have used the "UPDATE" SQL command on the save button and it does save the data on all 22 textboxes (all textboxes are linked to their separate columns). But only one record will be needed that is why I did not use the "INSERT" command.
The problem arises when I click the save button, all (19) textboxes are saved but when I retrieve the text (by reloading the form), each of the 20, 21, 22 textboxes (only) the text of the 20th textbox keeps on moving tho the next textbox e.g. 20>21>22>20>21>22 is interchanged amongst themselves.
Please help me (I googled this but found nothing on this) and please tell me why this is happening.
The code is below:
Dim sqCon As New SqlClient.SqlConnection("Data Source=.\SQLEXPRESS;Database=MegaDatabase;Integrated Security=SSPI")
Dim sqCmd As New SqlClient.SqlCommand
sqCmd.Connection = sqCon
Dim DatabaseErrorMsg As String = "Unable to save the details. Please contact the program developers."
Dim DatabaseErrorTitle As String = "Database Editing Error"
Dim DatabaseDoneSave As String = "New records made/updated successfully"
Dim CompNmtxtS As String
Dim TrdNmtxtS As String
Dim ComRegtxtS As String
Dim WTNmtxtS As String
Dim VRegtxtS As String
Dim TextBox1S As String
Dim ComPosttxtS As String
Dim StrAddrtxtS As String
Dim ComCitytxtS As String
Dim ComCounttxtS As String
Dim RegAddrtxtS As String
Dim ComZiptxtS As String
Dim RepTeltxtS As String
Dim ComFaxtxtS As String
Dim RepCelltxtS As String
Dim W_URLtxtS As String
Dim EWebtxtS As String
Dim BankNametxtS As String
Dim BankBranchtxtS As String
Dim BraCodetxtS As String
Dim BankAcctxtS As String
Dim TextBox2S As String
CompNmtxtS = CompNmtxt.Text
TrdNmtxtS = TrdNmtxt.Text
ComRegtxtS = ComRegtxt.Text
WTNmtxtS = WTNmtxt.Text
VRegtxtS = VRegtxt.Text
TextBox1S = TextBox1.Text
ComPosttxtS = ComPosttxt.Text
StrAddrtxtS = StrAddrtxt.Text
ComCitytxtS = ComCitytxt.Text
ComCounttxtS = ComCounttxt.Text
RegAddrtxtS = RegAddrtxt.Text
ComZiptxtS = ComZiptxt.Text
RepTeltxtS = RepTeltxt.Text
ComFaxtxtS = ComFaxtxt.Text
RepCelltxtS = RepCelltxt.Text
ComFaxtxtS = ComFaxtxt.Text
W_URLtxtS = W_URLtxt.Text
EWebtxtS = EWebtxt.Text
BankNametxtS = BankNametxt.Text
BankBranchtxtS = BankBranchtxt.Text
BraCodetxtS = BraCodetxt.Text
BankAcctxtS = BankAcctxt.Text
TextBox2S = TextBox2.Text
Try
'*NOTE: UPDATE function will only UPDATE the fields when there is already something in there, as it cannot work for the INSERT command
'Format for UPDATE command: USE DatabaseName; UPDATE Tablename SET ColumnName = '" & declared string name & "'"
sqCmd.CommandText = ("USE MegaDatabase; UPDATE CompDetails SET CompName = '" & CompNmtxtS & "', TradeName = '" & TrdNmtxtS & "', CompReg = '" & ComRegtxtS & "', WTnum = '" & WTNmtxtS & "', VATregNo = '" & VRegtxtS & "', TaxPeriod = '" & TextBox1S & "', CompPostalAddr = '" & ComPosttxtS & "', CompPhysAddr = '" & StrAddrtxtS & "', CompCity = '" & ComCitytxtS & "', CompCountry = '" & ComCounttxtS & "', CompProvince = '" & RegAddrtxtS & "', CompZip = '" & ComZiptxtS & "', CompTel = '" & RepTeltxtS & "', CompFax = '" & ComFaxtxtS & "', CompCell = '" & RepCelltxtS & "', CompWebsite = '" & W_URLtxtS & "', CompEmail = '" & EWebtxtS & "', CompBankName = '" & BankNametxtS & "', CompBranchName = '" & BankBranchtxtS & "', CurrentTaxTable = '" & TextBox2S & "', CompBranchCode = '" & BraCodetxtS & "', CompAccNo = '" & BankAcctxtS & "'")
sqCon.Open()
sqCmd.ExecuteNonQuery()
sqCon.Close()
Catch ex As Exception
MessageBox.Show(DatabaseErrorMsg, DatabaseErrorTitle, MessageBoxButtons.OK)
Finally
Me.Close()
frmMDImainform.MainMenuStrip.Enabled = True
MessageBox.Show(DatabaseDoneSave, "Done Saving...", MessageBoxButtons.OK)
End Try
For the loading part:
Try
sqCmd.CommandText = "SELECT TOP 1 [CompName],[TradeName],[CompReg],[WTnum],[VATregNo],[TaxPeriod],[CompPostalAddr],[CompPhysAddr],[CompCity],[CompCountry],[CompProvince],[CompZip],[CompTel],[CompFax],[CompCell],[CompWebsite],[CompEmail],[CompBankName],[CompBranchName],[CurrentTaxTable],[CompBranchCode],[CompAccNo] FROM [MegaDatabase].[dbo].[CompDetails]"
sqCon.Open()
sqRdr = sqCmd.ExecuteReader()
Catch ex As Exception
End Try
Do While sqRdr.Read() 'No need for VbTab and Vb crlf
CompNmtxt.Text = CompNmtxt.Text & sqRdr.GetValue(0)
TrdNmtxt.Text = TrdNmtxt.Text & sqRdr.GetValue(1)
ComRegtxt.Text = ComRegtxt.Text & sqRdr.GetValue(2)
WTNmtxt.Text = WTNmtxt.Text & sqRdr.GetValue(3)
VRegtxt.Text = VRegtxt.Text & sqRdr.GetValue(4)
TextBox1.Text = TextBox1.Text & sqRdr.GetValue(5)
ComPosttxt.Text = ComPosttxt.Text & sqRdr.GetValue(6)
StrAddrtxt.Text = StrAddrtxt.Text & sqRdr.GetValue(7)
ComCitytxt.Text = ComCitytxt.Text & sqRdr.GetValue(8)
ComCounttxt.Text = ComCounttxt.Text & sqRdr.GetValue(9)
RegAddrtxt.Text = RegAddrtxt.Text & sqRdr.GetValue(10)
ComZiptxt.Text = ComZiptxt.Text & sqRdr.GetValue(11)
RepTeltxt.Text = RepTeltxt.Text & sqRdr.GetValue(12)
ComFaxtxt.Text = ComFaxtxt.Text & sqRdr.GetValue(13)
RepCelltxt.Text = RepCelltxt.Text & sqRdr.GetValue(14)
W_URLtxt.Text = W_URLtxt.Text & sqRdr.GetValue(15)
EWebtxt.Text = EWebtxt.Text & sqRdr.GetValue(16)
BankNametxt.Text = BankNametxt.Text & sqRdr.GetValue(17)
BankBranchtxt.Text = BankBranchtxt.Text & sqRdr.GetValue(18)
BraCodetxt.Text = BraCodetxt.Text & sqRdr.GetValue(19)
BankAcctxt.Text = BankAcctxt.Text & sqRdr.GetValue(20)
TextBox2.Text = TextBox2.Text & sqRdr.GetValue(21)
Loop
Thanks for reading

Answer 1

You have a mixup in the order of your columns in your query vs. accessing the columns by index when reading your resultset:
In your query column #21 (last column, zero-based index) is [CompAccNo] but when reading you assign column #21 to TextBox2.Text.
I'd suggest you rather access your columns by name when reading:
CompNmtxt.Text = CompNmtxt.Text & sqRdr.GetValue("CompName")
TrdNmtxt.Text = TrdNmtxt.Text & sqRdr.GetValue("TradeName")
ComRegtxt.Text = ComRegtxt.Text & sqRdr.GetValue("CompReg")
'...
Another point: Get rid of creating your update query by concatenating user input - use Command Parameters instead!