Fix misleading documentation about structure assignments in With...End With statements

[Copilot]

• Fix misleading documentation about structure assignments in With...End With statements
• Update documentation to correctly explain when structure member assignments work vs fail
• Add comprehensive code examples showing valid and invalid scenarios
• Add snippets.5000.json file to fix sample build configuration
• Update vbproj file to target .NET Framework 4.8

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Internal previews

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docs/visual-basic/language-reference/statements/with-end-with-statement.md	docs/visual-basic/language-reference/statements/with-end-with-statement

[BillWagner]

@copilot

To get the samples build to work correctly, you need to add a snippets.5000.json file in the "samples/snippets/visualbasic/VS_Snippets_VBCSharp/vbvbalrwithstatement/vb" folder. The contents should be:

{
    "host": "visualstudio"
}

[Copilot]

@copilot

To get the samples build to work correctly, you need to add a snippets.5000.json file in the "samples/snippets/visualbasic/VS_Snippets_VBCSharp/vbvbalrwithstatement/vb" folder. The conte...

Added the snippets.5000.json file with the required host configuration. This should fix the samples build. Commit: 2f7db4b

[BillWagner]

@copilot The vbproj file needs to be updated to use .NET Framework 4.8.

[Copilot]

@copilot The vbproj file needs to be updated to use .NET Framework 4.8.

Updated the vbproj file to target .NET Framework 4.8 and removed the client profile setting. Commit: 69af60f

[BillWagner]

This is ready for final review

[gewarren]

Suggested change

The data type of `objectExpression` can be any class or structure type or even a Visual Basic elementary type such as `Integer`. If `objectExpression` is a structure, the ability to assign to its members depends on whether the structure expression is referenceable. You can assign to members of structures that are directly referenceable (such as variables, array elements, or fields), but you get an error if you try to assign values to members of structures that are returned by value from functions, properties, or operators, or when parentheses are used to cut reference ties (e.g., `With (structureVariable)`). This is the same error you would get if you invoked a method that returned a structure and immediately accessed and assigned a value to a member of the function’s result, such as `GetAPoint().x = 1`. The problem in both cases is that the structure exists only on the call stack, and there is no way a modified structure member in these situations can write to a location such that any other code in the program can observe the change.

The data type of `objectExpression` can be any class or structure type or even a Visual Basic elementary type such as `Integer`. If `objectExpression` is a structure, the ability to assign to its members depends on whether the structure expression is referenceable. You can assign to members of structures that are directly referenceable (such as variables, array elements, or fields), but you get an error if you try to assign values to members of structures that are returned by value from functions, properties, or operators, or when parentheses are used to cut reference ties (for example, `With (structureVariable)`). This is the same error you would get if you invoked a method that returned a structure and immediately accessed and assigned a value to a member of the function's result, such as `GetAPoint().x = 1`. The problem in both cases is that the structure exists only on the call stack, and there is no way a modified structure member in these situations can write to a location such that any other code in the program can observe the change.