I need to read a datagrid numbers of items, and programmatically add tabs to one tabControl. No problem on reading the datagrid, no problem in creating the model in the tabcontrol. So, I read the number of items, create the tabs accordingly, with all textboxes already with the correct values and so on.
At this point, the user will update some information on the tabs created, and need to click a Update button. At this point, I need to read all tabs, one by one, accessing all textboxes created, and send this to my database.
The only thing I got no result till now is “How to access these programmatically created Textboxes?
This is how I create the textboxes inside the TabControl
Dim TXT As New TextBox
TXT = New TextBox
TXT.Location = New System.Drawing.Point(213, 25)
TXT.Width = 303
TXT.TextAlign = HorizontalAlignment.Center
TXT.Name = "TXT_02_" & tab_counter
TXT.Text = MAT_DTCP(1) 'ABERTURA
TXT.BackColor = ColorTranslator.FromOle(RGB(128, 255, 255))
FORM_01.TBC_DTCP.SelectedTab.Controls.Add(TXT)
You could use LINQ:
Dim allTextBoxes = From tab In FORM_01.TBC_DTCP.TabPages.Cast(Of TabPage)()
From txt In tab.Controls.OfType(Of TextBox)()
Where txt.Name.StartsWith("TXT_02_")
Select txt
For Each txt As TextBox In allTextBoxes
' ... '
Next
Related
I need help. I want to check if user exists by entering their ic number and I want to display another rest of their data by using file in visual basic. Unfortunately, an error occurs while doing that. I need help. If the user exists, then It will display automatically name, email, address and so on but if a user doesn't exist, then it shows message box. Here I attached the image of the display screen and the code. Please help me. Thank you.
Public Class Form1
Private Sub btnSearch_Click(sender As Object, e As EventArgs) Handles btnSearch.Click
Dim userFile As String = "C:\Users\HP\Desktop\userdata.txt"
Dim inputFile As String
If System.IO.File.Exists(userFile) = True Then
Dim objReader As New System.IO.StreamReader(userFile)
Dim intIc As Integer
Dim intCount As Integer = 0
Dim strName As String
Dim strEmail As String
Dim intPhoneNum As String
Dim strAdd1 As String
Dim strAdd2 As String
Dim intPostcode As String
Dim strState As String
Do While objReader.Peek() <> -1
intIc(intCount) = Convert.ToInt64(objReader.ReadLine())
If (intIc(intCount).Convert.ToInt64(objReader.ReadLine())) Then
strName(intCount) = objReader.ReadLine()
strEmail(intCount) = objReader.ReadLine()
intPhoneNum(intCount) = Convert.ToInt32(objReader.ReadLine())
strAdd1(intCount) = objReader.ReadLine()
strAdd2(intCount) = objReader.ReadLine()
intPostcode(intCount) = Convert.ToInt32(objReader.ReadLine())
strState(intCount) = objReader.ReadLine()
lblName.Text = strName
lblEmail.Text = strEmail
lblNum.Text = intPhoneNum
lblAdd1.Text = strAdd1
lblAdd2.Text = strAdd2
lblPostcode.Text = intPostcode
lblState.Text = strState
objReader.Close()
Else
MessageBox.Show("User Does Not Exist")
End If
intCount = intCount + 1
Loop
Else
MessageBox.Show("File Does Not Exist")
End If
End Sub
End Class
Your task, the easy way:
make a new project
add a DataSet to this new project
open the DataSet, in the properties call it something sensible
Right click the surface, add a new datatable, name it Person
Right click the datatable, add a column, name it IC. Right click, add column, name it Name. Keep going until you added all the fields you want to track(email,phone,address1 etc)
save the DataSet
open the form
show the datasources window (view menu.. other windows)
expand the nodes til you can see Person
click the drop down next to Person, switch from DataGridview to Details
drag Person onto the form. Text boxes, labels etc appear. In the tray at the bottom more things appear
add a textbox to the form and call it searchTextBox
add a search button to the form, double click it, add this line of code to the click handler:
personBindingSource.Filter = '[ic] LIKE '" & searchTextBox.Text & "'"
If personBindingSource.Count = 0 Then MessageBox.Show("No records")
double click the form background to add a form load event handler, put this line of code:
If IO.File.Exists("data.xml") Then .ReadXml("data.xml")
switch back to designer, single click the form background and switch to event properties of the form, add a handler to the form closing event:
.WriteXml("data.xml")
That's it, you now have a program that will open, read and fill the DataSet with data from the data.xml file, it will search it when you type something in the ic box, the text boxes use databinding to show values automatically, and when you close the program it will save updates data. The only task now is to load the xml file with data.
When the textboxes were added to the form you should also have seen a bar appear across the top with some left/right controls in and a green plus. Click the green plus, type some data in, click it again, type more data. Navigating back, if you're adding new data, will commit the data. If you're looking at existing data, editing it then navigating will commit it
After you added some data, you can search for existing data using the search box. When you've searched for a single value it should be the only thing shown and the nav will show "1 of 1". To get back to the mode where all data is showing, put a single asterisk in the search box and hit search; it should show the number records in the top bar and you can scroll them with the arrows.
If you already have lots of data in a file, like you use in your question, you can read it in a loop (like you do in your question, except don't use that code exactly cos it has loads of errors) as a one time thing and assign it into the datatable, or you can manipulate it directly into being XML in a text editor. This is easy to do if you have a capable text editor but I'll not offer any particular advice on it in case you don't have a large amount of existing data. Ask a new question if you do
When creating a datagridview in VB.net I cannot get at the cells from anywhere except the Sub where it was made.
I tried placing the code in Form_Load and tried make the Sub Public.
I use Controls.Find, which finds the datagridview, but I cannot access any rows or cells. I can create textbox and label controls and access their text content from anywhere, but not so with the datagridview. This is odd to me.
Using and learning Visual Basic in Visual Studio 2017, for use in my own home business utility.
Dim dgv As New DataGridView
dgv.Location = New Point(2, 200)
dgv.Size = New Size(300, 50)
dgv.Name = "NewDGV"
Dim ColumnTitles() As String = {"ProdId", "Price"}
Dim ColumnWidths() As Integer = {50, 50)
For i = 0 To UBound(ColumnTitles)
Dim col As New DataGridViewTextBoxColumn
col.DataPropertyName = ColumnTitles(i)
col.HeaderText = ColumnTitles(i)
col.Name = ColumnTitles(i)
col.Width = ColumnWidths(i)
dgv.Columns.Add(col)
Next
Controls.Add(dgv)
‘the following sees the datagridview just fine
‘within the same sub
Dim x = dgv.Rows(0).Cells(0).Value
This is how I am creating this control. Perhaps I am Adding to Controls in the wrong way? I am open to better ways to do this.
Dim dgv As DataGridView = CType(Controls("NewDGV"), DataGridView)
dgv.Rows(0).Cells(0).Value = "I found you!"
What this does is find the first Control in the Controls collection, coerces it into a DataGridView type, and assigns it to the variable dgv. You can than manipulate dgv. In this case I put some text in the first cell on the first row.
You could ask the control collection for the instance of your datagridview
Dim MyDgv As DataGridView = Controls.Cast(Of DataGridView).First(Function(dgv) dgv.Name = "NewDGV")
Then work with "MyDGV" properties, methods, and/or events
Can I add multiple fields whenever I press a button (fields such TextBox) in VB.Net?
I tried this code but it didn't help me
Dim cLeft As Integer = 1
Public Function AddNewTextBox() As System.Windows.Forms.TextBox
Dim txt As New System.Windows.Forms.TextBox()
Me.Controls.Add(txt)
txt.Top = cLeft * 25
txt.Left = 150
txt.Text = "TextBox " & Me.cLeft.ToString
cLeft = cLeft + 1
Return txt
End Function
That control will not be visible if it's position is under an other control.
I have some suggestions.
Use a flow layout panel control. This will automatically position your controls.
Just add new controls to the flow layout panel control collection.
Test the positions and sizes of other controls on your form and identify a location that isn't inhabited by another control. Then add your control to that location.
Hide controls until you need them to be visible.
Place controls into a panel und use this as o sort of group to hide or show all relevant controls simultaneously.
but
Based on one of the followup questions which you answered, it sounds like you might be looking for a spreadsheet control. In this case, why not simply use a datagridview control?
I have a child form that is completely created in code.
I would like to add tool tips to the textbox controls on the form. I know how to set up the tool tips on the fly but can't find a way to add the tooltip control to the form on the fly. All the hits I find on google refer to dragging the control from the designers toolbox.
I would need to do something like:
' Add tool tip control
Dim toolTip1 As New ToolTip()
toolTip1.ShowAlways = True
frm.Controls.Add(toolTip1)
This does not work
I tried adding a sub to handle the from.load event(with a handler that poitn to the sub) at design time but can not get passed the error "Tooltip1 is not declared" when adding the tooltip to the iundividual dynamic controls.
If I call this dynamic form from a parent form and add the tooltip control to the parent form I can use it for the child form. But how would I do this if I was creating the form from a routine that does not live on a parent form?
thanks
Dim frm As New Form
' Add tool tip control
''Dim toolTip1 As New ToolTip()
''toolTip1.ShowAlways = True
'Draw the Form object
'close the dynamic frm if existing already
If frm IsNot Nothing Then
frm.Close()
End If
frm = New Form()
frm.AutoScaleDimensions = New System.Drawing.SizeF(6.0F, 13.0F)
frm.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
frm.Name = "frm_test"
'dimension is irrelevant at the moment
frm.ClientSize = New System.Drawing.Size(10, 10)
'the parent will be the current form
'frm.MdiParent = this;
'splash screen mode form, why not...
frm.ControlBox = True
frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
frm.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink
frm.BackColor = System.Drawing.Color.LightGray
For Each item As MYFILE.Class in the Collection
Dim aTextBox As New TextBox()
aTextBox.Font = New System.Drawing.Font(sFont, Single.Parse(sSizeFont), System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CByte(0))
aTextBox.BackColor = System.Drawing.Color.Yellow
aTextBox.Location = New System.Drawing.Point(iNewColumnPosition + 5 + intMaxWidthLabel, intVertPos)
aTextBox.Size = New System.Drawing.Size(intWidthTextBox + 10, intGapHeight)
'store the biggest width, so that the textboxes can be vertically aligned
If intWidthTextBox > intMaxWidthText Then
intMaxWidthText = intWidthTextBox
End If
'giving a name to all your object will be the only way
'to retrieve them and use them
'for the purpose of this sample, the name can be the
'same for all textboxes.
aTextBox.Name = item.ParameterName
'giving the maximun size in caracters for the textbox.
aTextBox.MaxLength = Integer.Parse(item.ParameterLength)
toolTip1.SetToolTip(aTextBox, "TIP" & intIndex.ToString)
'tab have to be ordered
aTextBox.TabIndex = intIndex
intIndex += 1
'Vertical position is to be manage according the
'tallest object in the form, in this case the
'textbox it self
intVertPos += intGapHeight
'adding the textbox to the form
frm.SuspendLayout()
aTextBox.SuspendLayout()
frm.Controls.Add(aTextBox)
Next
I left a lot of code out but this should give you an idea as to what I am doing
In vb it is
Dim tooltip As New ToolTip(components)
tooltip.SetToolTip(textBox1, "This is a textbox tooltip")
Sorry this is not in VB.NET but I am pretty sure you can easily convert this. The first line is to set ToolTip control to your form components. The second is how you set a tooltip to a control and give it the related text.
ToolTip tooltip = new ToolTip(components);
tooltip.SetToolTip(textBox1, "This is a textbox tooltip");
I have an application written in VB.NET that reads data from a file and displays the data on the screen.
Depending on the data in the file, the program has a TabControl with up to 3 tabs and each tab in turn has a DataGridView for displaying data. For example I have a TabControl that has a tab called "Saturday" and a tab called "Sunday".
The problem I am having is that when I read data from a file, the program displays all the data on the Saturday's tab grid because I am not sure how to reference the Grid on the Sunday tab.
To add the DataGridView I am using the following code:
Grid = New DataGridView
Grid.Dock = DockStyle.Fill
Grid.Name = "Grid" & TabControl.SelectedIndex
Grid.Tag = "Grid" & TabControl.SelectedIndex
And this is how I am reading the data in:
If reader.GetAttribute("controltype") = "Tab" Then
SelectedTab = reader.Name
End If
If reader.Name = "cell" Then
y = y + 1
Grid.Rows(i).Cells(y).Style.BackColor = Color.FromName(reader.ReadElementString("cell"))
End If
What I almost want to do is something like (pseudocode):
SelectedTab.Grid.Rows(i).Cells(y).Style.BackColor = Color.FromName(reader.ReadElementString("cell"))
However when I use the above code it complains:
'Grid' is not a member of 'String'
I hope you understand the issue. Let me know if you need clarification
Your code is a little unclear. However, it appears to me that the following line:
If reader.GetAttribute("controltype") = "Tab" Then
SelectedTab = reader.Name
End If
is creating at least one problem. It looks like you are attempting to refer to a Tabpage control by the string representation of its name, but unless I missed something, what that line is actually doing is trying to make a tabpage control type("SelectedTab") refer to a string type. If that is the case, then you will want to try this instead:
If reader.GetAttribute("controltype") = "Tab" Then
TabControl1.SelectedTab = TabControl1.TabPages(reader.name)
End If
It is a little hard to tell from the code you have posted, but that might get you headed down the right path.
++++++++++++
UPDATE: It appears from your code that you are naming each DGV control by appending the index of the tab on which it is located to the string "grid." I am going to assume that you are using a class member variable named "SelectedTab" to represent the current tab selected in the control. I will assume that at the top of your class you have done something like this:
'Form-or-class scoped memebr variables:
Private SelectedTab As TabPage
Private SelectedGrid As DataGridView
You should be able to refer to the active grid control using something like this:
Private Sub TabControl1_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles TabControl1.SelectedIndexChanged
' Set SelectedTab member variable to refer to the new selected tab page:
SelectedTab = TabControl1.SelectedTab
' Set the SelectedGrid to refer to the grid control hosted on the selected tab page:
SelectedGrid = TabControl1.SelectedTab.Controls("Grid" & TabControl1.SelectedIndex.ToString())
End Sub
From here, you should be able to use the member variable for SelectedGrid to refer to the grid present on which ever tab page is selected in your tab control.
It is challenging to address your concerns with only fragments of your code. If you have additional difficulties, please post more of your code, so we can better see what else is going on.
Hope that helps!
Okay, I would go about something like this. Maybe you can simply use a DataSet to load the XML data in one line (if they have been saved with DataSet.WriteXML before).
Dim ds As New DataSet
Dim p As TabPage
Dim gv As DataGridView
ds.ReadXml("F:\testdata.xml")
For i As Integer = TabControl1.TabPages.Count - 1 To 0 Step -1
TabControl1.TabPages.RemoveAt(i)
Next
For Each dt As DataTable In ds.Tables
p = New TabPage(dt.TableName)
gv = New DataGridView
' ... configure the gv here...
gv.AutoGenerateColumns = True
gv.Dock = DockStyle.Fill
' ...
gv.DataSource = dt
TabControl1.TabPages.Add(p)
p.Controls.Add(gv)
Next