HTML Markup
The HTML Markup consists of an ASP.Net GridView and a Button. For the GridView I have enabled paging using theAllowPaging property and I have also specified on the OnPageIndexChanging event.
<asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
RowStyle-BackColor="#A1DCF2" AlternatingRowStyle-BackColor="White" AlternatingRowStyle-ForeColor="#000"
runat="server" AutoGenerateColumns="false" AllowPaging="true" OnPageIndexChanging="OnPageIndexChanging">
<Columns>
<asp:BoundField DataField="ContactName" HeaderText="Contact Name" ItemStyle-Width="150px" />
<asp:BoundField DataField="City" HeaderText="City" ItemStyle-Width="100px"/>
<asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="100px" />
</Columns>
</asp:GridView>
<br />
<asp:Button ID="btnExport" runat="server" Text="Export To Excel" OnClick = "ExportToExcel" />
Namespaces
You will need to import the following namespaces
C#
using System.IO;
using System.Data;
using System.Drawing;
using System.Data.SqlClient;
using System.Configuration;
VB.Net
Imports System.IO
Imports System.Data
Imports System.Drawing
Imports System.Data.SqlClient
Imports System.Configuration
Binding the GridView
Below is the code to bind the GridView with records from the Customers table of the Northwind database
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.BindGrid();
}
}
private void BindGrid()
{
string strConnString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(strConnString))
{
using (SqlCommand cmd = new SqlCommand("SELECT * FROM Customers"))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
}
}
}
VB.Net
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Me.BindGrid()
End If
End Sub
Private Sub BindGrid()
Dim strConnString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Using con As New SqlConnection(strConnString)
Using cmd As New SqlCommand("SELECT * FROM Customers")
Using sda As New SqlDataAdapter()
cmd.Connection = con
sda.SelectCommand = cmd
Using dt As New DataTable()
sda.Fill(dt)
GridView1.DataSource = dt
GridView1.DataBind()
End Using
End Using
End Using
End Using
End Sub
Implement Paging in GridView
The OnPageIndexChanging event handles the Pagination in the GridView
C#
protected void OnPageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
this.BindGrid();
}
VB.Net
Protected Sub OnPageIndexChanging(sender As Object, e As GridViewPageEventArgs)
GridView1.PageIndex = e.NewPageIndex
Me.BindGrid()
End Sub
Export GridView with Paging Enabled to Excel
Below is the code to Export GridView to Excel file with Paging enabled. Firstly the GridView is again populated with data from database after setting AllowPaging to false.
Then a loop is executed on all rows of the GridView and the colors of the Row and the Alternating Row are applied to their individual cells. If this is not done then the color will spread on all cells of the Excel sheet for each row
Class textmode is applied to all cells so that they are rendered as text as per mso number format, doing this prevents large numbers from getting converted to exponential values.
C#
protected void ExportToExcel(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
using (StringWriter sw = new StringWriter())
{
HtmlTextWriter hw = new HtmlTextWriter(sw);
//To Export all pages
GridView1.AllowPaging = false;
this.BindGrid();
GridView1.HeaderRow.BackColor = Color.White;
foreach (TableCell cell in GridView1.HeaderRow.Cells)
{
cell.BackColor = GridView1.HeaderStyle.BackColor;
}
foreach (GridViewRow row in GridView1.Rows)
{
row.BackColor = Color.White;
row.Cells[2].BackColor=Color.Red;
row.Cells[2].BackColor=Color.Red;
foreach (TableCell cell in row.Cells)
{
if (row.RowIndex % 2 == 0)
{
cell.BackColor = GridView1.AlternatingRowStyle.BackColor;
}
else
{
cell.BackColor = GridView1.RowStyle.BackColor;
}
cell.CssClass = "textmode";
}
}
GridView1.RenderControl(hw);
//style to format numbers to string
string style = @"<style> .textmode { } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
}
public override void VerifyRenderingInServerForm(Control control)
{
/* Verifies that the control is rendered */
}
VB.Net
Protected Sub ExportToExcel(sender As Object, e As EventArgs)
Response.Clear()
Response.Buffer = True
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls")
Response.Charset = ""
Response.ContentType = "application/vnd.ms-excel"
Using sw As New StringWriter()
Dim hw As New HtmlTextWriter(sw)
'To Export all pages
GridView1.AllowPaging = False
Me.BindGrid()
GridView1.HeaderRow.BackColor = Color.White
For Each cell As TableCell In GridView1.HeaderRow.Cells
cell.BackColor = GridView1.HeaderStyle.BackColor
Next
For Each row As GridViewRow In GridView1.Rows
row.BackColor = Color.White
For Each cell As TableCell In row.Cells
If row.RowIndex Mod 2 = 0 Then
cell.BackColor = GridView1.AlternatingRowStyle.BackColor
Else
cell.BackColor = GridView1.RowStyle.BackColor
End If
cell.CssClass = "textmode"
Next
Next
GridView1.RenderControl(hw)
'style to format numbers to string
Dim style As String = "<style> .textmode { } </style>"
Response.Write(style)
Response.Output.Write(sw.ToString())
Response.Flush()
Response.[End]()
End Using
End Sub
Public Overrides Sub VerifyRenderingInServerForm(control As Control)
' Verifies that the control is rendered
End Sub
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