<div>
DataTable x = new DataTable(); = &nbsp;you are creating a table. it is not a database table.<br />
<br />
x.Columns.Add(&quot;Code&quot;, typeof(int)); = &nbsp;you are adding a column of type int to the table x.<br />
<br />
<br />
below the code is for adding some values to it<br />
<br />
DataRow dr=x.NewRow();<br />
dr[&quot;Code&quot;]=&quot;1&quot;<br />
dt.Rows.Add(dt)<br />
<br />
<br />
<br />

</div>


DataTable x = new DataTable(); =  you are creating a table. it is not a database table.

x.Columns.Add("Code", typeof(int)); =  you are adding a column of type int to the table x.


below the code is for adding some values to it

DataRow dr=x.NewRow();
dr["Code"]="1"
dt.Rows.Add(dt)





<div>
if there is no second parameter there e.g.,:<br />
&nbsp;<br />
&nbsp; &nbsp; &nbsp; &nbsp;x.Columns.Add(&quot;val&quot;);<br />
&nbsp;does this mean that the column type will be string?
</div>


if there is no second parameter there e.g.,:
 
       x.Columns.Add("val");
 does this mean that the column type will be string?

<div>
<div class="content wysiwyg-content">
what is the meaning of these two lines:<br />
DataTable x = new DataTable();<br />
x.Columns.Add(&quot;Code&quot;, typeof(int));<br />
<br />
I mean conceptually what are they doing (especially in a windows applications). I would like special description of pupose of second line.
</div>
</div>


what is the meaning of these two lines:
DataTable x = new DataTable();
x.Columns.Add("Code", typeof(int));

I mean conceptually what are they doing (especially in a windows applications). I would like special description of pupose of second line.

C# (in memory table

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Most development for the Microsoft platform is done utilizing the technologies supported by the.NET framework. Other development is done using Visual Basic for Applications (VBA) for programs like Access, Excel, Word and Outlook, with PowerShell for scripting, or with SQL for large databases.

Microsoft Development

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.