Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

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Hi Everyone!

I have trouble in this error wherein i didnt understand how i will adjust this command..please help me and thank you in advance...

VB

Dim Item As ListViewItem = DirectCast(lvsummary.Items(0), ListViewItem)
        Dim txtid As TextBox = DirectCast(Item.FindControl("idTextbox"), TextBox)

in which the error in this line : Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

i already add the parameter on this command:
txtid.Text = cmdtest.Parameters("@id").Value

Posted 4-Jun-13 19:49pm

Member 10033107

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-06-04T19:53:00

Solution 1

You have only one index here, 0. Therefore, lvsummary.Items element count it zero. Before accessing any array or collection with zero-based indexing, make sure there is at least one element.

—SA

Posted 4-Jun-13 19:53pm

Sergey Alexandrovich Kryukov

_Amy · Answer 2 · 2013-06-04T19:58:00

Solution 2

This exception is obvious. You are trying to access a member of an collection which does not exist. For e.g. your ListView is not having any item or it is null but still if you are trying to access the ListItem. This will throw an error. Try stepping through your code and check the value of lvsummary.
Try this:

VB

Dim Item As ListViewItem = CType(lvsummary.Items(0), ListViewItem)
If Not Item.FindControl("idTextbox") Is Nothing
    Dim txtid As TextBox = CType(Item.FindControl("idTextbox"), TextBox)
End If

--Amit

Posted 4-Jun-13 19:58pm

_Amy

Updated 4-Jun-13 20:19pm

v2

Comments

Member 10033107 5-Jun-13 2:02am

Hi Amit thanks for the reply,..
Lvsummary is the a listview id of my listviewtable wherein i want to call a value i posted for id..

Member 10033107 5-Jun-13 2:02am

and by the way what is CType that you call in your comment?? thanks

_Amy 5-Jun-13 2:04am

CType returns the result of explicitly converting an expression to a specified data type, object, structure, class, or interface.

Member 10033107 5-Jun-13 2:08am

okay thank you i will try this command thanks again

Member 10033107 5-Jun-13 2:18am

amit, can you give me an example for this command because it expect end if statement

_Amy 5-Jun-13 2:20am

Refer http://msdn.microsoft.com/en-us/library/4x2877xb(v=vs.80).aspx[^]

Member 10033107 5-Jun-13 4:13am

Ammit.. after i put your code the error called again.. why im a suppose to do?

_Amy 5-Jun-13 4:16am

Step through your code and check for lvsummary.Items(0).

Member 10033107 5-Jun-13 5:47am

actually amit i used this source as my basis:

Protected Sub Button1_Click(sender As Object, e As EventArgs)
Dim item As GridDataItem = DirectCast(RadGrid1.Items(0), GridDataItem)
'accessing first grid item
Dim id As Integer = Convert.ToInt16(item("EmployeeID").Text)
Dim txtname As TextBox = DirectCast(item.FindControl("TextBox1"), TextBox)
Dim name As String = txtname.Text
Dim list As DropDownList = DirectCast(item.FindControl("DropDownList1"), DropDownList)
Dim user As String = list.SelectedValue
Dim con As New SqlConnection(WebConfigurationManager.ConnectionStrings("NorthwindConnectionString").ConnectionString)
Dim cmd As New SqlCommand("INSERT INTO Employees (EmployeeID,FirstName,user_role) values(@EmployeeID,@FirstName,@user_role) ", con)
cmd.Parameters.Add(New SqlParameter("@EmployeeID", id))
cmd.Parameters.Add(New SqlParameter("@FirstName", name))
cmd.Parameters.Add(New SqlParameter("@user_role", user))
con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Sub

for declaring my listview and change this code also for the output i want to imply to my project as well i called lvsummary as my listview id..so there.. i just open up this within my error.. yet within the lvsummary it indicates the items expect to my listview table wherein i was able to call those values using the database and they have all ready values in the database table and i also declare stored procedure.. and i dont know why is it still called an error .. im so confused already..