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How to check for a valid Base64 encoded string

Is there a way in C# to see if a string is Base 64 encoded other than just trying to convert it and see if there is an error? I have code code like this: ...
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How can you encode a string to Base64 in JavaScript?

I have a PHP script that can encode a PNG image to a Base64 string. 26 Answers 26 ...
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How to do Base64 encoding in node.js?

Does node.js have built-in base64 encoding yet? 7 Answers 7 ...
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Convert base64 string to ArrayBuffer

I need to convert a base64 encode string into an ArrayBuffer. The base64 strings are user input, they will be copy and pasted from an email, so they're not there when the page is loaded. I would like to do this in javascript without making an ajax call to the server if possible. ...
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Convert Base64 string to an image file? [duplicate]

I am trying to convert my base64 image string to an image file. This is my Base64 string: 8 Answers ...
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How do I do base64 encoding on iOS?

I'd like to do base64 encoding and decoding, but I could not find any support from the iPhone SDK . How can I do base64 encoding and decoding with or without a library? ...
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How do I encode and decode a base64 string?

... Encode public static string Base64Encode(string plainText) { var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText); return System.Convert.ToBase64String(plainTextBytes); } Decode public static string Base64Decode(string base64Encoded...
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Encoding as Base64 in Java

I need to encode some data in the Base64 encoding in Java. How do I do that? What is the name of the class that provides a Base64 encoder? ...
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Convert blob to base64

This is a snippet for the code that I want to do Blob to Base64 string: 9 Answers ...
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Why do I need 'b' to encode a string with Base64?

Following this python example , I encode a string as Base64 with: 5 Answers 5 ...