Step 1: - Design
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplicationDemo.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
Step 2: - Code
CSV file contain header.
using
System;
using
System.Data;
using
System.IO;
using
System.Linq;
namespace
WebApplicationDemo
{
public partial class WebForm1 :
System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (!FileUpload1.HasFile || Path.GetExtension(FileUpload1.PostedFile.FileName).ToLower()
!= ".csv")
{
Response.Write("Choose
file to Upload. Only .CSV file allowed.");
return;
}
else
{
DataTable dt = new DataTable("Table1");
dt.Columns.Add("Column1", typeof(string));
dt.Columns.Add("Column2", typeof(string));
dt.Columns.Add("Column3", typeof(string));
string[] validHeader = { "column1", "column2", "column3" };
string inputContent;
bool headerCheck = false;
using (StreamReader inputStreamReader = new StreamReader(FileUpload1.PostedFile.InputStream))
{
inputContent = inputStreamReader.ReadToEnd();
string[] stringSeparators = new string[] { "\r\n" };
foreach (var noOfRow in
inputContent.Split(stringSeparators, StringSplitOptions.None))
{
if (!string.IsNullOrEmpty(noOfRow))
{
if (noOfRow.Split(',').Count() > dt.Columns.Count)
{
Response.Write("Only " + dt.Columns.Count + " columns allowed. Remove comma(,) at
the end of each row.");
return;
}
else if (noOfRow.Split(',').Count() < dt.Columns.Count)
{
Response.Write("CSV file contain less than " + dt.Columns.Count + " columns. Upload CSV file with " + dt.Columns.Count + "
columns.");
return;
}
if (!headerCheck)
{
foreach (var row in noOfRow.Split(','))
{
if (validHeader.Contains(row.ToLower()))
headerCheck = true;
else
{
Response.Write("CSV
file contain invalid header.");
return;
}
}
}
else
{
dt.Rows.Add();
int i = 0;
foreach (var row in noOfRow.Split(','))
{
dt.Rows[dt.Rows.Count - 1][i] = row;
i++;
}
}
}
}
if (dt.Rows.Count > 0)
{
//Add Code here
}
else
{
Response.Write("Atleast
one record required to upload.");
return;
}
}
}
}
}
}
CSV file not contain header.
using
System;
using
System.Data;
using
System.IO;
using
System.Linq;
namespace
WebApplicationDemo
{
public partial class WebForm1 :
System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (!FileUpload1.HasFile || Path.GetExtension(FileUpload1.PostedFile.FileName).ToLower()
!= ".csv")
{
Response.Write("Choose
file to Upload. Only .CSV file allowed.");
return;
}
else
{
DataTable dt = new DataTable("Table1");
dt.Columns.Add("Column1", typeof(string));
dt.Columns.Add("Column2", typeof(string));
dt.Columns.Add("Column3", typeof(string));
string inputContent;
using (StreamReader inputStreamReader = new StreamReader(FileUpload1.PostedFile.InputStream))
{
inputContent = inputStreamReader.ReadToEnd();
string[] stringSeparators = new string[] { "\r\n" };
foreach (var noOfRow in
inputContent.Split(stringSeparators, StringSplitOptions.None))
{
if (!string.IsNullOrEmpty(noOfRow))
{
if (noOfRow.Split(',').Count() > dt.Columns.Count)
{
Response.Write("Only " + dt.Columns.Count + " columns allowed. Remove comma(,) at
the end of each row.");
return;
}
else if (noOfRow.Split(',').Count() < dt.Columns.Count)
{
Response.Write("CSV file contain less than " + dt.Columns.Count + " columns. Upload CSV file with " + dt.Columns.Count + "
columns.");
return;
}
else
{
dt.Rows.Add();
int i = 0;
foreach (var row in noOfRow.Split(','))
{
dt.Rows[dt.Rows.Count - 1][i] = row;
i++;
}
}
}
}
if (dt.Rows.Count > 0)
{
//Add Code here
}
else
{
Response.Write("Atleast
one record required to upload.");
return;
}
}
}
}
}
}
