asked on problem with databinding
Hi , i am following a book to learn about data binding
i wrote this function dataload() in exam.vb.
now i want to call this function from web form, but its saying, " name data load not declared"
where is the problem ??
Thanks in advance
i wrote this function dataload() in exam.vb.
now i want to call this function from web form, but its saying, " name data load not declared"
where is the problem ??
Thanks in advance
Imports Microsoft.VisualBasic
Imports System.Data
Module exam
Public Class exam
Public Function DataLoad() As ICollection
Dim dt As DataTable = New DataTable()
Dim dv As DataView
Dim dr As DataRow
' Add two columns to the DataTable
dt.Columns.Add(New DataColumn( _
"ExamNumber", GetType(String)))
dt.Columns.Add(New DataColumn( _
"ExamName", GetType(String)))
' Put some data in
dr = dt.NewRow()
dr(0) = "305"
dr(1) = "Web Applications With VB.NET"
dt.Rows.Add(dr)
dr = dt.NewRow()
dr(0) = "306"
dr(1) = "Windows Applications With VB.NET"
dt.Rows.Add(dr)
dr = dt.NewRow()
dr(0) = "310"
dr(1) = "XML With VB.NET"
dt.Rows.Add(dr)
dr = dt.NewRow()
dr(0) = "315"
dr(1) = "Web Applications With Visual C# .NET"
dt.Rows.Add(dr)
dr = dt.NewRow()
dr(0) = "316"
dr(1) = _
"Windows Applications With Visual C# .NET"
dt.Rows.Add(dr)
dr = dt.NewRow()
dr(0) = "320"
dr(1) = "XML With Visual C# .NET"
dt.Rows.Add(dr)
' And return the datatable
' wrapped in a dataview
dv = New DataView(dt)
Return dv
End Function
End Class
End Module
webform :
Partial Class thankyou
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
lbExams.DataSource = DataLoad()
lbExams.DataTextField = "ExamName"
DataBind()
End Sub
End Class
.NET ProgrammingASP.NET
Last Comment
fosiul01
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First do you need to have a Module? I've never seen one used in ASP.NET. I've seen them on Console Apps but...
Anyways, If I were you, i'd take Module exam and End Module out.
Then add the key word Shared to the definition of the function (Public Shared Dataload)
Then you'd be ready to do: lbExams.DataSource = exam.DataLoad()
Anyways, If I were you, i'd take Module exam and End Module out.
Then add the key word Shared to the definition of the function (Public Shared Dataload)
Then you'd be ready to do: lbExams.DataSource = exam.DataLoad()
ASKER
Omm problem is, i am following the code from book
MCAD/MCSD.NET Training Guide (Exam 70-305): Developing and Implementing Web Applications with Visual Basic .NET and Visual Studio® .NET
if i take your advise, then it would be like this is not it ?
Public Shared Function DataLoad() As ICollection
Dim dt As DataTable = New DataTable()
Dim dv As DataView
Dim dr As DataRow
........
........
dv = New DataView(dt)
Return dv
End Function
if this is right , still its same problem --1
But if i want to keep as author said, then what is the solution ?? -2
MCAD/MCSD.NET Training Guide (Exam 70-305): Developing and Implementing Web Applications with Visual Basic .NET and Visual Studio® .NET
if i take your advise, then it would be like this is not it ?
Public Shared Function DataLoad() As ICollection
Dim dt As DataTable = New DataTable()
Dim dv As DataView
Dim dr As DataRow
........
........
dv = New DataView(dt)
Return dv
End Function
if this is right , still its same problem --1
But if i want to keep as author said, then what is the solution ?? -2
the_bachelor is right about the Module/End Module statements (I missed that).
Your web form is the "thankyou" class, and the DataLoad() function is in the "exam" class. Either the DataLoad() function needs to be in the same class as your web form, you need to create an instance of the "exam" class and call it's DataLoad() method, or declare the the DataLoad() as Shared (which makes more sense).
You can't call functions that belong to other classes without somehow referring to the class that contains them.
Your web form is the "thankyou" class, and the DataLoad() function is in the "exam" class. Either the DataLoad() function needs to be in the same class as your web form, you need to create an instance of the "exam" class and call it's DataLoad() method, or declare the the DataLoad() as Shared (which makes more sense).
You can't call functions that belong to other classes without somehow referring to the class that contains them.
ASKER
problme is, how i will create instances ?? here is the problem.
Give me these solution :
1. i want to call dataload function from exam class to thankyou class, but how i will call ?? Please give me the code.( i realy dont know how to call)
2. I tried to make the function, shared, but still its same ,
Give me these solution :
1. i want to call dataload function from exam class to thankyou class, but how i will call ?? Please give me the code.( i realy dont know how to call)
2. I tried to make the function, shared, but still its same ,
fosiul01,
I'm no author. I dont think tgerbert is either. But I'm studying for Exam 70-536 myself. And I ran inton my share of buggy stuff.
Authors are mere mortals like everybody. Sometimes they copy and paste the wrong stuff. Check out the documentation. I believe they provide you/us the readers with a website with corrected code.
I'm no author. I dont think tgerbert is either. But I'm studying for Exam 70-536 myself. And I ran inton my share of buggy stuff.
Authors are mere mortals like everybody. Sometimes they copy and paste the wrong stuff. Check out the documentation. I believe they provide you/us the readers with a website with corrected code.
you create an instance of the class exam by doing
Dim math_exam as exam = new exam
Then can do somthn like lbExams.DataSource = math_exam.DataLoad.
Dim math_exam as exam = new exam
Then can do somthn like lbExams.DataSource = math_exam.DataLoad.
ASKER
HI the_bachelor ,
I understand i will have to write something like this in thankyou class
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim mydataload As myexam = New exam
' ??????????????????????????
lbExams.DataSource = DataLoad()
lbExams.DataTextField = "ExamName"
DataBind()
End Sub
You will just have to show me , how i will call dataload here
I understand i will have to write something like this in thankyou class
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim mydataload As myexam = New exam
' ??????????????????????????
lbExams.DataSource = DataLoad()
lbExams.DataTextField = "ExamName"
DataBind()
End Sub
You will just have to show me , how i will call dataload here
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ASKER
Sorry i didnot see your post.
Ok its done with these code :
Dim datal As exam = New exam
lbExams.DataSource = datal.DataLoad()
lbExams.DataTextField = "ExamName"
DataBind()
And i had to stay with this syntax :
Public Function DataLoad() As ICollection
***** if write public shared Function DataLoad() As ICollection ***
it gives error with this syntax :
Dim datal As exam = New exam
Now last question i want to ask :
suppose if i write as you said "public shared Function DataLoad() As ICollection "
How i would of call the dataload() function in thankyou class ??
Ok its done with these code :
Dim datal As exam = New exam
lbExams.DataSource = datal.DataLoad()
lbExams.DataTextField = "ExamName"
DataBind()
And i had to stay with this syntax :
Public Function DataLoad() As ICollection
***** if write public shared Function DataLoad() As ICollection ***
it gives error with this syntax :
Dim datal As exam = New exam
Now last question i want to ask :
suppose if i write as you said "public shared Function DataLoad() As ICollection "
How i would of call the dataload() function in thankyou class ??
if you had Shared then you wouldnt have to have an instance of the exam class before you call the DataLoad function.
You could just go directly:
lbExams.DataSource = exam.Dataload()
You could just go directly:
lbExams.DataSource = exam.Dataload()
ASKER
yap, right . i have learned 2 things today
thanks to stay with me, i will close this question now.
thanks to stay with me, i will close this question now.
I guessed i will have to call that function in webform
but problme is, how i will call ?? can you please write that code for me please ?
what code what i write in webform to call that dataload function from exam class to web form ?