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Mohammad Mirzaie
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2
661
Collection Was Modified; Enumeration Operation May Not Execu
May 22 2020 1:49 PM
Hello everyone,
I am new in VB.net, I have a treeview which first level node is populated with years. I have written some code which should read each node from tree view and add its months from datatabe under the year. I have written two nested For Each loop in vb.net but face the below problem. Please help me to solve the issue.
Error:
Collection Was Modified
;
Enumeration Operation May Not Execute
.
Code:
Dim monthdt As DataTable = getMonthData()
For Each yearNode As TreeNode In TreeView2.Nodes
For Each row As DataRow In monthdt.Rows
Dim month As New TreeNode()
If row("year").ToString() = yearNode.Text Then
month.Text = row("month").ToString()
month.SelectAction = TreeNodeSelectAction.Select
TreeView2.Nodes.Add(month)
End If
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error in calculation
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