Introduction: In this post I try to explain how we can
download the file from Gridview Data Control.
Description:
I have created a table name DOWNLOAD_ASSIGNMENT. Here ID is
primary key.
ID
|
int
|
CLASS
|
varchar(50)
|
ASSIGNMENT
|
varchar(MAX)
|
Add the Connectionstring in web.config file of website.
<configuration>
<connectionStrings>
<add name="con" connectionString="Data Source=SYS-1F78031ED0A;Initial
Catalog=TestBlog;Integrated Security=True"/>
</connectionStrings>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
</configuration>
Add a new webform to project. Drag and drop the Gridview
Data Control from Toolbox.
<asp:GridView ID="grdassignment" runat="server" AutoGenerateColumns="False"
CssClass="Hover" RowStyle-CssClass="Hover"
DataKeyNames="ASSIGNMENT" onrowcommand="grdassignment_RowCommand"
>
<Columns>
<asp:TemplateField HeaderText="CLASS">
<ItemTemplate>
<asp:Label ID="lblname" runat="server" Text='<%# Eval("CLASS") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="DOWNLOAD ASSIGNMENT">
<ItemTemplate>
<asp:LinkButton ID="lnkdownlaod" runat="server" CommandArgument='<%# Eval("ASSIGNMENT") %>' CommandName="download"><b
style="margin-left:50px;">Download</b></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Now go to .aspx.cs page.
using
System.Data;
using
System.Data.SqlClient;
using
System.Configuration;
protected void
Page_Load(object sender, EventArgs e)
{
if
(!IsPostBack)
{
Bindgridview();
}
}
private void Bindgridview()
{
try
{
SqlConnection
con = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ToString());
con.Open();
SqlCommand
cmd = new SqlCommand("select * from DOWNLOAD_ASSIGNMENT",
con);
SqlDataReader
dr = cmd.ExecuteReader();
grdassignment.DataSource = dr;
grdassignment.DataBind();
}
catch (Exception ex)
{
}
}
protected void grdassignment_RowCommand(object sender, GridViewCommandEventArgs
e)
{
{
try
{
if
(e.CommandName == "download")
{
string
filename = e.CommandArgument.ToString();
if
(filename != "")
{
string filepath = MapPath(filename);
byte[] bts = System.IO.File.ReadAllBytes(filepath);
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;
filename=" + filename);
Response.BinaryWrite(bts);
Response.Flush();
Response.End();
}
}
}
catch
(Exception ex)
{
}
}
}
In VB (.aspx.vb)
Imports
System.Data
Imports
System.Data.SqlClient
Imports
System.Configuration
Protected Sub Page_Load(ByVal
sender As Object,
ByVal e As
System.EventArgs) Handles
Me.Load
If Not IsPostBack Then
Bindgridview()
End If
End Sub
Private Sub Bindgridview()
Try
Dim
con As New SqlConnection(ConfigurationManager.ConnectionStrings("con").ToString())
con.Open()
Dim cmd As New SqlCommand("select
* from DOWNLOAD_ASSIGNMENT", con)
Dim
dr As SqlDataReader
= cmd.ExecuteReader()
grdassignment.DataSource = dr
grdassignment.DataBind()
Catch
ex As Exception
End Try
End Sub
Protected Sub grdassignment_RowCommand(ByVal
sender As Object,
ByVal e As GridViewCommandEventArgs)
Try
If
e.CommandName = "download" Then
Dim
filename As String
= e.CommandArgument.ToString()
If
filename <> "" Then
Dim
filepath As String
= MapPath(filename)
Dim
bts As Byte() =
System.IO.File.ReadAllBytes(filepath)
Response.ClearHeaders()
Response.AddHeader("Content-Disposition", "attachment;
filename=" & filename)
Response.BinaryWrite(bts)
Response.Flush()
Response.[End]()
End
If
End If
Catch
ex As Exception
End Try
End Sub
Now run the project and
check the result.
If yes post your comment to admire my work. You can like me on Facebook, Google+, Linkedin and Twitter via hit on Follow us Button and also can get update follow by Email.
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