gridveiw grouping in vb.net code

Question

could you please provide me gridview grouping in vb.net code

Vishal Joshi · Answer

To implement grouping in a DataGridView in VB.NET you can use a combination of custom grouping logic and visual representation adjustments. Here's a step-by-step example. Step 1: Define the Group Class Public Class Group Public Property GroupName As String Public Property Items As List(Of Object) ' Change Object to your data type Public Sub New(name As String) GroupName = name Items = New List(Of Object)() End Sub End Class Step 2: Prepare and Group Data Public Function GroupData(data As List(Of Object) groupBy As Func(Of Object String)) As List(Of Group) Dim groupedData As New List(Of Group)() ' Group the data For Each item In data Dim groupName As String = groupBy(item) Dim group As Group = groupedData.FirstOrDefault(Function(g) g.GroupName = groupName) If group Is Nothing Then group = New Group(groupName) groupedData.Add(group) End If group.Items.Add(item) Next Return groupedData End Function Step 3: Bind Grouped Data to DataGridView Public Sub BindGroupedData(dataGridView As DataGridView groupedData As List(Of Group)) dataGridView.Rows.Clear() dataGridView.Columns.Clear() ' Define columns (assuming you have two columns: Group and Item) dataGridView.Columns.Add(GroupColumn Group) dataGridView.Columns.Add(ItemColumn Item) ' Populate the DataGridView For Each group In groupedData ' Add a group row Dim groupRow As DataGridViewRow = New DataGridViewRow() groupRow.CreateCells(dataGridView group.GroupName Nothing) groupRow.DefaultCellStyle.BackColor = Color.LightGray dataGridView.Rows.Add(groupRow) ' Add items in the group For Each item In group.Items ' Assuming item has a ToString method for display Dim itemRow As DataGridViewRow = New DataGridViewRow() itemRow.CreateCells(dataGridView  item.ToString()) dataGridView.Rows.Add(itemRow) Next Next End Sub Step 4: Use the Grouping and Binding Functions Public Sub LoadAndGroupData() ' Sample data Dim data As New List(Of String) From {Apple Banana Cherry Avocado Blueberry Cantaloupe} ' Group by first letter Dim groupedData As List(Of Group) = GroupData(data Function(item) item.Substring(0 1)) ' Bind grouped data to DataGridView BindGroupedData(DataGridView1 groupedData) End Sub Call the LoadAndGroupData method when you want to load and display the grouped data in your DataGridView. Private Sub Form1_Load(sender As Object e As EventArgs) Handles MyBase.Load LoadAndGroupData() End Sub This approach creates a simple way to group and display data in a DataGridView in VB.NET. You can adjust the data types grouping logic and display format according to your specific requirements.

Sarthak Varshney · Answer

This example will demonstrate how to group data by a specific column in VB.NET Imports System.Data Imports System.Linq Public Class Form1 Private Sub Form1_Load(sender As Object e As EventArgs) Handles MyBase.Load ' Create a DataTable with some example data Dim dt As New DataTable() dt.Columns.Add(Category GetType(String)) dt.Columns.Add(Item GetType(String)) dt.Columns.Add(Quantity GetType(Integer)) dt.Rows.Add(Fruits Apple 10) dt.Rows.Add(Fruits Banana 20) dt.Rows.Add(Vegetables Carrot 15) dt.Rows.Add(Vegetables Broccoli 5) dt.Rows.Add(Fruits Orange 30) dt.Rows.Add(Vegetables Spinach 12) ' Set the DataSource of the DataGridView dataGridView1.DataSource = dt ' Group the data by Category column GroupGridView() End Sub Private Sub GroupGridView() Dim dt As DataTable = DirectCast(dataGridView1.DataSource DataTable) Dim groupedData = dt.AsEnumerable() _ .GroupBy(Function(row) row.Field(Of String)(Category)) _ .Select(Function(g) New With { .Category = g.Key .Items = g.ToList() }) ' Clear the existing rows and columns dataGridView1.Columns.Clear() dataGridView1.Rows.Clear() ' Add grouped data to the DataGridView For Each group In groupedData ' Add the group header Dim groupRow As DataGridViewRow = New DataGridViewRow() groupRow.CreateCells(dataGridView1 group.Category ) groupRow.DefaultCellStyle.BackColor = Color.LightGray dataGridView1.Rows.Add(groupRow) ' Add the group items For Each item In group.Items Dim itemRow As DataGridViewRow = New DataGridViewRow() itemRow.CreateCells(dataGridView1  item.Field(Of String)(Item) item.Field(Of Integer)(Quantity)) dataGridView1.Rows.Add(itemRow) Next Next ' Adjust the column widths dataGridView1.AutoResizeColumns() End Sub End Class