ProblemwithfindTextBoxinASP.net - asp.net

Question

i have the problem, that i create a TextBox via vb.net Code while the programm ist running.
Private Sub GenerateTBSourcePath()
'Generiert eine neue leere Textbox
Dim tBox As System.Web.UI.WebControls.TextBox = New System.Web.UI.WebControls.TextBox()
tBox.Width = 400
Dim tbID As Integer = tbSourcePathID + 1
tBox.ID = "tbSourcePath_" + tbID.ToString()
pSourcePath.Controls.Add(tBox)
End Sub
When i try to search for the TextBox on pSourcePath i cant find any TextBox.
Have anyone an idea what do i wrong?
i add the TextBox in start of my programm. I can see the TextBox also in the Browser. When i want to save the Text i cant find the TextBox.
Private Sub SaveTBox()
'Für jede TBox den Eintrag in der DB aktualisieren oder einen neuen Eintrag anlegen
For Each PControl As System.Web.UI.Control In pSourcePath.Controls
Dim Controltype As String = PControl.GetType().FullName
Select Case Controltype
Case "System.Web.UI.WebControls.TextBox"
Dim tBox As WebControls.TextBox = CType(PControl, WebControls.TextBox)
If CheckExists(tBox.ID) = True
'Update
Administration_DataSource.UpdateCommand = "Update di_source set PATH = '" & tBox.Text & "' where TBID = '" & tBox.ID & "'"
Administration_DataSource.Update()
Else
'Insert
tbSourcePathID = tbSourcePathID + 1
Administration_DataSource.InsertCommand = "Insert Into di_source(ID, PATH, TBID) values('" & tbSourcePathID & "', '" & tBox.Text & "', '" & tBox.ID & "')"
Administration_DataSource.Insert()
End If
End Select
Next
End Sub

Answer 1

I tried this code
int tbSourcePathID = 0;
TextBox tBox = new TextBox();
PlaceHolder pSourcePath = new PlaceHolder();
tBox.Width = 400;
int tbID = tbSourcePathID + 1;
tBox.ID = "tbSourcePath_" + tbID.ToString();
pSourcePath.Controls.Add(tBox);
foreach (System.Web.UI.Control PControl in pSourcePath.Controls)
{
string Controltype = PControl.GetType().FullName;
switch (Controltype)
{
case "System.Web.UI.WebControls.TextBox":
bool here = true;
break;
}
}
and it works. Maybe the problem is in CheckExists(). Remember also the use of FindControl()