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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

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