Asp.net Sql Insert rows using select case - asp.net

Question

Im designing a website that allows a user to update a database with information. The problem I am having is that I have created various controls that are hidden when the page loads, but the user can click to unhide to add additional info.
The issue I am coming up against is writing the sql statement to handle identifying what controls are used. I have a viewstate count to let me know which panels are visible or not.
ViewState("count") = CInt(ViewState("count")) + 1
Label1.Text = ViewState("count").ToString()
And then the code behind to write the SQL query I have looks like this
Protected Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim myConn As SqlConnection
Dim cmd As SqlCommand
Dim sqlstring As String
Dim dd As String
Dim mm As String
Dim yy As String
dd = Left(TextBox1.Text, 2)
mm = Mid(TextBox1.Text, 4, 2)
yy = Right(TextBox1.Text, 4)
myConn = New SqlConnection("xxx")
myConn.Open()
Select Case Label1.Text
Case Is = "0"
sqlstring = "INSERT INTO Transactions (Date, Account, Payee, Chq_Num, Reference, GST_Rate, Amount, Document_Number, Bank_Account) VALUES ('" & yy & "-" & mm & "-" & dd & "','" & DropDownList3.SelectedValue & "','" & TextBox3.Text & "','" & TextBox5.Text & "','" & TextBox4.Text & "'," & DropDownList2.SelectedValue & "," & TextBox6.Text & "," & TextBox27.Text & ",'" & DropDownList1.SelectedValue & "')"
Case Is = "1"
sqlstring = "INSERT INTO Transactions (Date, Account, Payee, Chq_Num, Reference, GST_Rate, Amount, Document_Number, Bank_Account) VALUES ('" & yy & "-" & mm & "-" & dd & "','" & DropDownList3.SelectedValue & "','" & TextBox3.Text & "','" & TextBox5.Text & "','" & TextBox4.Text & "'," & DropDownList2.SelectedValue & "," & TextBox6.Text & "," & TextBox27.Text & ",'" & DropDownList1.SelectedValue & "') VALUES ('" & yy & "-" & mm & "-" & dd & "','" & DropDownList4.SelectedValue & "','" & TextBox7.Text & "','" & TextBox9.Text & "','" & TextBox8.Text & "'," & DropDownList5.SelectedValue & "," & TextBox10.Text & "," & TextBox27.Text & ",'" & DropDownList1.SelectedValue & "')"
End Select
cmd = New SqlCommand(sqlstring, myConn)
cmd.ExecuteNonQuery()
myConn.Close()
Response.Redirect(Request.RawUrl, True)
End Sub
My problem lies in the select case as when case is 1 it is only inserting the first values and not the second set. I have up to 6 "cases" to choose from, each time adding an additional set of values. Sql server is 2008
Any help is appreciated

Answer 1

I may be wrong but in the second statement the clause VALUES appears two two times.
That might be the source of your problem.

Answer 2

as above however you are going to end up with a horribly long string by the 6th case might want to re-engineer it to check >= each value if the previous strings are immutable

Answer 3

From SQL Server 2008 onwards, you can use the multi-values insert clause that looks like this
INSERT [INTO] tbl [(...columns...)]
VALUES (....),(....),(....);
You have constructed your query like this
INSERT [INTO] tbl [(...columns...)]
VALUES (....)
VALUES (....)
VALUES (....)
I would also personally have constructed the string concatenation not using a SELECT-CASE block:
If Label1.Text >= "0" Then
sqlstring = "('" & yy & "-" & mm & "-" & dd & "','" & DropDownList3.SelectedValue & "','" & TextBox3.Text & "','" & TextBox5.Text & "','" & TextBox4.Text & "'," & DropDownList2.SelectedValue & "," & TextBox6.Text & "," & TextBox27.Text & ",'" & DropDownList1.SelectedValue & "')"
End If
If Label1.Text >= "1" Then
sqlstring = sqlstring + "," + "('" & yy & "-" & mm & "-" & dd & "','" & DropDownList4.SelectedValue & "','" & TextBox7.Text & "','" & TextBox9.Text & "','" & TextBox8.Text & "'," & DropDownList5.SelectedValue & "," & TextBox10.Text & "," & TextBox27.Text & ",'" & DropDownList1.SelectedValue & "')"
End If
' etc
If for whatever arcane reason the multi-values statement doesn't work, you can always rely on the tried and true multi-statement batch, i.e.
If Label1.Text >= "0" Then
sqlstring = "INSERT ... VALUES (...);"
End If
If Label1.Text >= "1" Then
sqlstring = sqlstring + "INSERT ... VALUES (...);"
End If
If Label1.Text >= "2" Then
sqlstring = sqlstring + "INSERT ... VALUES (...);"
End If
' etc
Note the semicolon statement terminators within the batch.

Answer 4

The issue was not the select case but the viewstate not passing to the sql string correctly, I know possibly not the best solution but passed the label.text to a hidden textbox, which the sql string was able to read properly. Richard's suggestion to use a concatenated IF statement instead of Select Case was a great idea!
Thanks for all the help