C# confusion with this code

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C#

this is my code

//part of the idle stuff
        [StructLayout(LayoutKind.Sequential)]
        struct LASTINPUTINFO
        {
            public static readonly int SizeOf = Marshal.SizeOf(typeof(LASTINPUTINFO));

            [MarshalAs(UnmanagedType.U4)]
            public UInt32 cbSize;
            [MarshalAs(UnmanagedType.U4)]
            public UInt32 dwTime;
        }

uint idleTime = 0;
            LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();

            //int y = Convert.ToInt32(lastInputInfo);
            uint y = Convert.ToUInt32(lastInputInfo);
            lastInputInfo.cbSize = Marshal.SizeOf(y);
            lastInputInfo.dwTime = 0;</pre>

i used both those methods by the way because it can't make up its mind and this is my error


<code>Error 1 Cannot implicitly convert type 'int' to 'uint'. An explicit conversion exists (are you missing a cast?) Z:\UnHidden\UnHidden\Form1.cs 48 36 UnHidden</code>

and i get the same error with each of those convert codes, can some one please tell me whats happening and how i can possibly fix this?