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there is not much other ways.<br />
<br />
one thing you need to be cautious, from your code you seem to use the keypress (or keydown) event. a user would be able to paste a numeric value if you only handle this event
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there is not much other ways.

one thing you need to be cautious, from your code you seem to use the keypress (or keydown) event. a user would be able to paste a numeric value if you only handle this event

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purestring() or ispurestring() is not a .net function <br />
<br />
<i>what are the ways and library functions &nbsp;available in vb.net &nbsp;? </i><br />
<br />
There are thousands of built-in functions available in .net, depending upon which version of .net you are referring to.. <br />
<br />
<i>if (keycode&gt;=65 and keycode&lt;=<b>90</b>)or (keycode &gt;=97 and keycode&lt;=122)</i><br />
<br />
Don't know where you got 92 but 90 is 'Z'
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purestring() or ispurestring() is not a .net function

what are the ways and library functions  available in vb.net  ?

There are thousands of built-in functions available in .net, depending upon which version of .net you are referring to..

if (keycode>=65 and keycode<=90)or (keycode >=97 and keycode<=122)

Don't know where you got 92 but 90 is 'Z'

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Is this an ASP.Net application you are using or a Windows application?
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Is this an ASP.Net application you are using or a Windows application?

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my application is vb.net windows application
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my application is vb.net windows application

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You can find vb.net code in the link I have provided.
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You can find vb.net code in the link I have provided.

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in the link provided by darjimaulik, click the VB tab.
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in the link provided by darjimaulik, click the VB tab.

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<div class="content wysiwyg-content">
how to check IsPureString() function in vb.net ?<br />
<br />
if &nbsp;(keycode&gt;=65 and keycode&lt;=92 )or (keycode &gt;=97 and keycode&lt;=122) &nbsp;then<br />
<br />
this is to validate ispurestring or not. &nbsp; &nbsp;except this idea, what are the ways and libarary functions &nbsp;available in vb.net &nbsp;?
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how to check IsPureString() function in vb.net ?

if  (keycode>=65 and keycode<=92 )or (keycode >=97 and keycode<=122)  then

this is to validate ispurestring or not.    except this idea, what are the ways and libarary functions  available in vb.net  ?

how to find a data that is pure string   or not in vb.net ?

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Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

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.