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Modernized and slightly modified version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

Modification as suggested in @Palec's comment of @Shaun Bowe answer.

Modernized and slightly modified version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

Modification as suggested in @Palec's comment of @Shaun Bowe answer.

Or as a one-liner (suggested by @satnhak):

public static Stream ToStream(this string value, Encoding encoding = null) => new MemoryStream((encoding ?? Encoding.UTF8).GetBytes(value ?? string.Empty)); 

Modernized and slightly modified version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

It was suggested in a comment of @JoelNet's answer and @Shaun Bowe answer. Modification as suggested in @Palec's comment.

Modernized and slightly modified version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

Modification as suggested in @Palec's comment of @Shaun Bowe answer.

Modernized version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

It was suggested in a comment of @JoelNet's answer and @Shaun Bowe answer. Because I agree with @Palec's comment.

Modernized and slightly modified version of the extension methods for ToStream:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8); public static Stream ToStream(this string value, Encoding encoding) => new MemoryStream(encoding.GetBytes(value ?? string.Empty)); 

It was suggested in a comment of @JoelNet's answer and @Shaun Bowe answer. Modification as suggested in @Palec's comment.