Merge GridView Cells Or Columns in Row ASP.NET C# VB.NET

In this example i am going to describe how to merge GridView cells or Columns in gridview rows containing same data or content using C# and VB.NET in ASP.NET

For this i m using DataBound Event of gridview, counting total rows and then checking each cells value against value of same cell in previous row and then setting the RowSpan of cells.

For this i have created a table containing Counties ,states and respective cities and country and state cells / columns are merged in rows having same country or states.


For knowing how to merge Gridview headers read article below
Merging GridView Header Columns or multiple Headers


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Html source of the page look like this

<asp:GridView ID="GridView1" runat="server" 
    AutoGenerateColumns="False"  
    BorderStyle="None" BorderWidth="1px" CellPadding="4" 
    GridLines="Horizontal" ForeColor="Black" 
    Height="119px" DataSourceID="SqlDataSource1" 
    OnDataBound="GridView1_DataBound1"> 
            <Columns>
            <asp:BoundField DataField="Country" 
                            HeaderText="Country" 
                            SortExpression="Country" />
            <asp:BoundField DataField="State" 
                            HeaderText="State" 
                            SortExpression="State" />
            <asp:BoundField DataField="City" 
                            HeaderText="City" 
                            SortExpression="City" />
        </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [Country], [State], [City] 
               FROM [Details] ORDER BY [State]">
</asp:SqlDataSource>

C# code behind

01protected void GridView1_DataBound1(object sender, EventArgs e)

02{

03  for (int rowIndex = GridView1.Rows.Count - 2;

04                                     rowIndex >= 0; rowIndex--)

05  {

06    GridViewRow gvRow = GridView1.Rows[rowIndex];

07    GridViewRow gvPreviousRow = GridView1.Rows[rowIndex + 1];

08    for (int cellCount = 0; cellCount < gvRow.Cells.Count;

09                                                  cellCount++)

10    {

11     if (gvRow.Cells[cellCount].Text ==

12                            gvPreviousRow.Cells[cellCount].Text)

13     {

14       if (gvPreviousRow.Cells[cellCount].RowSpan < 2)

15       {

16         gvRow.Cells[cellCount].RowSpan = 2;

17       }

18       else

19       {

20        gvRow.Cells[cellCount].RowSpan =

21            gvPreviousRow.Cells[cellCount].RowSpan + 1;

22       }

23       gvPreviousRow.Cells[cellCount].Visible = false;

24    }

25   }

26 }

27}

VB.NET code behind

01Protected Sub GridView1_DataBound1

02           (ByVal sender As Object, ByVal e As EventArgs)

03 

04For rowIndex As Integer = GridView1.Rows.Count - 2 To 0 Step -1

05    Dim gvRow As GridViewRow = GridView1.Rows(rowIndex)

06    Dim gvPreviousRow As GridViewRow = GridView1.Rows(rowIndex + 1)

07    For cellCount As Integer = 0 To gvRow.Cells.Count - 1

08    If gvRow.Cells(cellCount).Text =

09                         gvPreviousRow.Cells(cellCount).Text Then

10    If gvPreviousRow.Cells(cellCount).RowSpan < 2 Then

11    gvRow.Cells(cellCount).RowSpan = 2

12    Else

13    gvRow.Cells(cellCount).RowSpan =

14                       gvPreviousRow.Cells(cellCount).RowSpan + 1

15    End If

16    gvPreviousRow.Cells(cellCount).Visible = False

17    End If

18    Next

19  Next

20End Sub

Download sample code attached