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If speed is an issue, you only have one option IMO<br />
<br />
I have done various document automation processes and GemBox Spreadsheet is the fastest library I have found. <br />
<a href="https://www.gemboxsoftware.com/spreadsheet" rel="ugc">https://www.gemboxsoftware.com/spreadsheet</a>
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If speed is an issue, you only have one option IMO

I have done various document automation processes and GemBox Spreadsheet is the fastest library I have found.
https://www.gemboxsoftware.com/spreadsheet [https://www.gemboxsoftware.com/spreadsheet]

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GemBox &nbsp;is good library,<br />
But in some cases GemBox &nbsp;can be not free. Also you can use NPOI. It is free low-level api to work with excel.
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GemBox  is good library,
But in some cases GemBox  can be not free. Also you can use NPOI. It is free low-level api to work with excel.

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Thanks,Any vb.net code please , appreciate it
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Thanks,Any vb.net code please , appreciate it

RIAS

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<blockquote>
In vain you refuse good libraries. Many actions are already made for you in this lybraries. 
</blockquote>
Not only do libraries make it easier, GemBox does not use Office so you do not need licenses and it is <b>20 times faster</b> than Office automation
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> In vain you refuse good libraries. Many actions are already made for you in this lybraries.

Not only do libraries make it easier, GemBox does not use Office so you do not need licenses and it is 20 times faster than Office automation

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<div class="content wysiwyg-content">
Hi,<br />
I am using vb.net desktop version, need to convert a excel sheet to csv. <br />
Need to calculate the used range of excel and convert it into comma seperated csv. <br />
<br />
***Please note speed is an issue here, if you suggest any code with high performance it will be appreciated the most. <br />
Thanks
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Hi,
I am using vb.net desktop version, need to convert a excel sheet to csv. 
Need to calculate the used range of excel and convert it into comma seperated csv. 

***Please note speed is an issue here, if you suggest any code with high performance it will be appreciated the most. 
Thanks

excel sheet

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