If you would like to hide the columnheaders of a datagridview in your winforms application then here is the code for that.
‘ This will hide all the column headers for your datagridview
In VB.NET use this code
DataGridView1.ColumnHeadersVisible = False
In C# use the following code
dataGridView1.ColumnHeadersVisible = false;Dim dt as new DataTable
' Add the columns which you need in your datatable
dt.Columns.Add("SNo", GetType(Integer)) '1
dt.Columns.Add("Details", GetType(String)) '2
dt.Columns.Add("Qty", GetType(String)) '3
dt.Columns.Add("UnitRate", GetType(Double)) '4
dt.Columns.Add("ApplyTax", GetType(Boolean)) '5
dt.Columns.Add("ExTaxTotal", GetType(Double)) '6
dt.Columns.Add("Tax", GetType(Double)) '7
dt.Columns.Add("InclTaxTotal", GetType(Double)) '8
' Create a new row for your table
Dim drow = dt.NewRow()
' Now add the items in your newly created row
drow.Item(0) = 1
drow.Item(1) = "My Details go here"
drow.Item(2) = 1
drow.Item(3) = 234
drow.Item(4) = 1
drow.Item(5) = drow.Item(2) * drow.Item(3) ' You can also calculate the values
drow.Item(6) = drow.Item(2) * 0.1
drow.Item(7) = drow.Item(5) * drow.Item(6)
' Now add this row to the table
dt.Rows.Add(drow)
' If you want you can display this data in a datagrid
Me.DataGridView1.DataSource = dt
To get the list of installed printers on your computer use the following code which will populate a Combo box with the list of installed printers.
Private Sub PopulateInstalledPrintersCombo() ' Add list of installed printers found to the combo box. ' The pkInstalledPrinters string will be used to provide the display string. Dim i As Integer Dim pkInstalledPrinters As String For i = 0 To Printing.PrinterSettings.InstalledPrinters.Count - 1 pkInstalledPrinters = Printing.PrinterSettings.InstalledPrinters.Item(i) comboInstalledPrinters.Items.Add(pkInstalledPrinters) Next End Sub
Learn how to printer address labels on Dymo Label Printer in VB.NET
If you have the need to print the address labels then this script will get you started, this is a very simple script which will get
you started. You can visit Dymo website site and checkup the SDK for complex scenarios.
Assumption
I assume that you have already attached a Dymo Label printer to your computer.
I am using Dymo LabelWriter 400
Step 1
You would need to add references to your your project
Step 2
On top of your form add the following imports.
Imports DYMO.Common Imports DYMOPrintingSupportLib Imports DYMO.DLS.Runtime
Step 3
Add a button on your form and call it btnPrintLabel
Step 4
Add the following lines of code to the click event of your button
Private Sub btnPrintLabel_Click(sender As Object, e As EventArgs) Handles btnPrintLabel.Click
Dim Label As DYMO.Label.Framework.ILabel
Label = DYMO.Label.Framework.Framework.Open("C:\Users\User\Documents\DYMO Label\Labels\Holroyd Council.label")
Label.SetAddressText(0, "First address Line" & vbCrLf & "Second Line" & vbCrLf & "Third Line")
Label.Print("DYMO LabelWriter 400") ' This is the name of my printer, replace it with your printer name
End Sub
If you are trying to use the simplemembership in mvc4 in visual studio and if you get this error
Here is a simple fix for this
This error will come when your table owner is not dbo.
Change the table ownership in SQL Server by using the following command
EXEC sp_changeobjectowner 'UserProfile', 'dbo'
There are numerous example for C3 but I had to spend quite some time to adapt it to my project using VB.NET
Hope it can be of help to you.
I assume that you have
already added the GridMVC package from NUGET.
Here are step by step guide
Controller
No change needed , see a sample below,
Function Index() As ActionResult
Return View(db.Categories.ToList())
End Function
View
Add the following import at the top of your view
@imports GridMVC.html
You would need to reference the following also
Add the stylesheets (check the location after you install the GridMVC package)
<link href=”~/Content/Gridmvc.css” rel=”stylesheet” />
<link href=”~/Content/gridmvc.datepicker.min.css” rel=”stylesheet” />
For your paging support
Install the PagedList package also
Once you have installed this package then add the following reference to your view, this will help you format your paging buttons
properly.
<link href=”~/Content/PagedList.css” rel=”stylesheet” />
Add the following code for your Grid to appear – In the following examples my Model has three fields – CatId, CatName
and ParentCatId. Make changes to suit your needs.
@Html.Grid(Model).Columns(Function(columns)
columns.Add(Function(o) o.CatID).Titled(“Cat #“).SetWidth(40)
columns.Add(Function(o) o.CatName).Titled(“Category“).SetWidth(100)
columns.Add(Function(o) o.ParentCatID).Titled(“Parent Cat #“).SetWidth(40)
End Function
).WithPaging(10).Sortable(True)
In your Create Actions in a Controller in MVC4, if you try to save text with html tags then you get this annoying error.
A potentially dangerous Request.Form value was detected from the client
Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.
This is a great protection if you do not want your client to save html text.
Here is how to get rid of this error
In the following example we have a create action which saves a new record. MVC4 controller will have two functions.
The first function is for GET ( this is the one which will render the page to save the new record
The second function is for POST. This function is responsible to receive the model
which has been populated by the data which the user has filled in on the form. We have to add the following text
<ValidateInput(False)>
for C# add
[ValidateInput(false)]
‘ GET: /admin/ManageAds/Create
Function Create() As ActionResult
Return View()
End Function
‘ POST: /admin/ManageAds/Create
<HttpPost()> _
<ValidateAntiForgeryToken()> _
<ValidateInput(False)>
Function Create(ByVal ad As Ad) As ActionResult
If ModelState.IsValid Then
db.Ads.Add(ad)
db.SaveChanges()
Return RedirectToAction(“Index”)
End If
Return View(ad)
End Function
Here is a simple function to generate the RSS feeds.
This article assumes that you are using MVC4 project with Entity Framework. Just iterate through
the relevant table to pick your data which you want to show in the RSS feed.
Remember to add the following import statements at the top of your controller
Imports System.Xml
Imports System.IO
In your controller create a function as shown below. There is no need to create a corresponding View for it
as the function will write to the RESPONSE and the XML output will be provided by the XMLTextWriter.
Function RSSNewArticles() As Action
Response.Clear()
Response.ContentType = “text/xml”
Dim objX As New XmlTextWriter(Response.OutputStream, Encoding.UTF8)
objX.WriteStartDocument()
objX.WriteStartElement(“rss”)
objX.WriteAttributeString(“version”, “2.0”)
objX.WriteStartElement(“channel”)
objX.WriteElementString(“title”, “MyWebsite.com RSS Feed“)
objX.WriteElementString(“link”, “http://mywebsite.com“)
objX.WriteElementString(“description”, “My website New Articles Feed“)
‘ objX.WriteElementString(“copyright”, “(c) 2014, best-answer.net“)
objX.WriteElementString(“ttl”, “10”)‘Populate record for the RSS feed
For Each item In db.MyDataTable
objX.WriteStartElement(“item”)
objX.WriteElementString(“title”, item.CatName)
objX.WriteElementString(“link”, “http://mywebsite/” & item.RecordID & “/” & item.TitleName)
objX.WriteElementString(“pubDate”, Now)
objX.WriteEndElement()
NextobjX.WriteEndElement()
objX.WriteEndElement()
objX.WriteEndDocument()
objX.Flush()
objX.Close()
Response.End()
End Function
How to allow File Downloads in MVC4 using VB.NET
We are using an ActionResult instead of FileResult.
Function download(id as Integer) As ActionResult
The reason is that if use the FileResult and your file does not exist then it will show a blank page, instead of this
we are using an ActionResult which is more versatile.
We can return the actual FileResult if the file exists
and in case of an error we can return a View (if we used a FileResult
Function download(id as Integer) As ActionResult
‘ In this example we are using the id to pick up the actual file from a model
Dim SoundFile as SoundFile = db.SoundFiles.Find(id)
Dim path As String = Server.MapPath(“~/myLocation/” & SoundFile.MP3File)
‘get file object as FileInfo
Dim fileinfo As System.IO.FileInfo = New System.IO.FileInfo(path)‘– if the file exists on the server
If fileinfo.Exists Then
rep.IncrementDownloadCount(id) ‘This is my routine to count the downloads, you will not need it
Return File(path, “application/octet-stream”, fileinfo.Name)
Else
Return View(“Error”)
End IfEnd Function
In SQL you would use the following query to get the count of number of rows in a table.
Select count(*) from tblMyData
In LINQ
In VB.NET you would use the following to get it
Dim v = (From u In MyContext.MyTable).Count()
In C# you would use the following syntax
var v= (from u in MyContext.MyTable).Count();You variable v will not contain the count