I am trying to write datagrid in VB.NET. I don't see the table. I have the calling statement in the main program and the calling function as:

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I am trying to write datagrid in VB.NET. I don't see the table. I have the calling statement in the main program and the calling function as:

What I have tried:

 If results.Rows.Count > 1 Then
                Call GridView1_SelectedIndexChanged(_DogID, _Name, _OwnerID)
            End If



Protected Sub GridView1_SelectedIndexChanged(Id As Integer, Name As String, Owner As Integer)
        
        Dim dogTags As New DataTable()       
        dogTags.Rows.Add(_DogID, _Name, _OwnerID)
        GridView1.DataSource = dogTags       
        GridView1.DataBind()

    End Sub

Posted 28-Feb-18 10:56am

Savi kolla

Updated 28-Feb-18 22:20pm

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Maciej Los · Answer 1 · 2018-02-28T22:20:00

The reason is obvious: you are destroing previous data every time when you call procedure GridView1_SelectedIndexChanged.

Move this line Dim dogTags As New DataTable() outside the procedure (for example: after InitializeComponent method).
Then change your procedure this way:

VB.NET

'Dim dogTags As New DataTable()       

Protected Sub GridView1_SelectedIndexChanged(Id As Integer, Name As String, Owner As Integer)
        
        Dim dt As DataTable = DirectCast(GridView1.DataSource, DataTable)
        Dim row As DataRow = dt.NewRow()
        'do not forget to change column names respectively to their names in your project!
        row("DogId") = Id
        row("Name") = Name
        row("Owner") = Owner
        dogTags.Rows.Add(row)
        GridView1.DataSource = dogTags       
End Sub

In a meanwhile. please read this:
Scope in Visual Basic | Microsoft Docs[^]
Variable and Method Scope in Microsoft .NET[^]
How to: Control the Scope of a Variable (Visual Basic) | Microsoft Docs[^]
DirectCast Operator (Visual Basic) | Microsoft Docs[^]
How to: Add Rows to a DataTable[^]