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'Hyperspace_Cheese_Battle.Program.RocketInSquare(int, int)': not all code paths return a value [closed]

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static bool RocketInSquare(int X, int Y)
{
}
As it says in the title, this is the error I am getting and I can't seem to understand what it means, can anyone help me?

You defined a method that is expected to return a bool value. So the compiler is going to error unless you return a value like so:
static bool RocketInSquare(int X, int Y)
{
return false;
}

How to know the page break in Excel using C# [closed]

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I´m using C# to create and format a Excel spreadsheet, so I need to format (merge cells, change the font, etc) until the final of the first page. How can I know the final line of the page in the Excel spreadsheet?

The following code will give you the last row number before every horizontal page break in an Excel worksheet:
foreach (Excel.HPageBreak pageBreak in worksheet.HPageBreaks)
{
int row = pageBreak.Location.Row - 1;
// ...
}

How to change the decimal to 12 digit string [closed]

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How to change the double (currency) to 12 digit in c# toString();
For example
12.50 => 000000001250

Try this:
string value = ((decimal)(12.50 * 100)).ToString().PadLeft(12, '0');

int a = (int)(12.50 * 100);
Console.WriteLine((a).ToString("D12"));

Try this
string formattedValue = value.ToString("000000000000");
value being the input and formattedValue as the output.

How to display a string variable in a specific number format like "#,0.##" [closed]

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I have a typed dataset with a column called price, which is of string datatype. And I'm showing this via ultrgrid/datagrid
How can I show the price in number format.
For example: price ==123456
in the grid it should be like 12,354,56

Try this
var a = price.ToString("##,###,##");
Reference

Custom Numeric Format Strings!

Look at some of the related links to the right of the screen. Some of them even ask the same question as you !

ArrayList<Uri> Intent. How to write in C# [closed]

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How to write this in C#?
Intent intent = new Intent(Intent.ActionSendMultiple, Android.Provider.MediaStore.Images.Media.ExternalContentUri);
handler(intent);
....
void handler(Intent intent)
{
ArrayList<Uri> imageUris = intent.GetParcelableArrayListExtra(Intent.ExtraStream);
...
}

ArrayList is available is c# but it does not have a generic (<T>) form. ArrayList is a list of objects.
What you want is System.Collections.Generic.List<T>
EDIT : In response to comments, try this;
List<Uri> imageUris = new List<Uri>(intent.GetIntegerArrayListExtra(Intent.ExtraStream));

Easy, just use List<Uri>. It's also faster than ArrayList.