Skip to main content

How to Read & Write Data in Excel Files with C#.NET 2005

Have you ever tried to read and write data in any Excel file with C#.NET 2005 or higher. The following code shows how to read and write with an Excel file having the following structure:


Structure of Excel File

SrNo

Ename

Salary


1. For Reading the Data from Excel File.(Format .xls/.xlss)

//Code for reading the contents of Excel file and display the same on datagridview

private void button1_Click(object sender, EventArgs e)

{

//FOR READING THE EXCEL FILE

OleDbConnection vConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\rohit.xls;Extended Properties=Excel 12.0");


//Reading the Content from a sheet named Employees

String strSQL = "SELECT * FROM [Employees$]";

OleDbCommand cmd = new OleDbCommand(strSQL, vConn);

DataSet ds = new DataSet();

OleDbDataAdapter da = new OleDbDataAdapter(cmd);

da.Fill(ds,"emp");


//Displaying the data read from Excel and displayed on datagridview.

dataGridView1.DataSource = ds;

dataGridView1.DataMember = "emp";

vConn.Close();


}


2. For Writing the Data into Excel File.(Format .xls/.xlss)

private void button2_Click(object sender, EventArgs e)

{

//WRITING TO THE EXCEL FILE

OleDbConnection vConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\rohit.xls;Extended Properties=Excel 12.0");

// Write to Excel file

vConn.Open();

String vSrno="100";

String vEname="Oh My God";

String vSalary="90000";

String strSQL = "insert into [Employees$] ([SRNO], [ENAME], [SALARY]) values( '" + vSrno + "', '" + vEname + "','"+vSalary+"')";


OleDbCommand cmd = new OleDbCommand(strSQL, vConn);

cmd.ExecuteNonQuery();


MessageBox.Show("inserted");

vConn.Close();

}


The above code simplifies the process of reading and writing into the excel file.


Labels:

Comments

Post a Comment

Popular posts from this blog

How to use QueryExtenderControl in ASP.NET with LINQ

Queryextender control is a control that helps in doing actions like filtration, searching, sorting etc. on the LINQ Data source with few steps. In fact we don’t have to write any code with this. Screenshot given below is just an example that can easily be achieved through this control. In the above screenshot, we can see that there is a GridView Control that has been binded to a LINQData Source Control. And we have a DropDownlistBox that is also binded to another LINQData Source Control and displaying only grouped jobs. The GridView display all the employees who are matching the Job Parameter. This is done through QueryExtender Control. Also we can search for any name in the employee name's through Query Extender control. The code in the HTML goes like: < form id ="form1" runat ="server">     < div >         Select Job: < asp : DropDownList ID ="Job" runat ="server" DataSourceID ="LinqDataSource2...
Post a Comment
Read more

Using GUID or UniqueIdentifiers in SQL Server

In order to differentiate between two rows, we normally use primary keys or identity values which may be same across two tables. In order to overcome this problem we can use a special type named "GUID" . Its a hexadecimal number (Base 16) and the advantage is  that they are unique across all databases and tables.  In SQL Server the same concept is implemented through UNIQUEIDENTIFIER  data type. In order to generate a new value, we use the NEWID() function. For e.g.  a. Creating a table that uses the UNIQUEIDENTIFIER datatype Create table Test ( Empno uniqueidentifier, Ename varchar(20) ) b. Inserting rows in the tables with the use of NEWID() function insert into Test values (newId(),'ABC') insert into Test values (newid(),'XYZ') insert into test values (newid(),'MNO') c. Selecting the rows from the table. Select * from test  Empno                             ...
Post a Comment
Read more

How to Delete Record through Knex.

This post is all about of deleting records through KNEX ORM in Nodejs. The following code shows how to achieve this: knex("depts").where("deptno","50").del() .then(function (count) {     console.log(count); }) .finally(function () {     knex.destroy(); }); The above code deletes a record from a table "Depts" where Deptno = 50. It has a "then" Promise attached that will show how many records were deleted with this command. Also "finally" is the method that will always execute and will close the KNEX connection. Happy Coding !!!
Post a Comment
Read more