C#

using System;

namespace Tester
{
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
		{
			const int repeats = 200;

			byte[] bytes1 = randomBytes(4 * 1000000);
			byte[] bytes2 = new byte[bytes1.Length];
			for (int i=0; i<bytes1.Length; i++)
				bytes1[i] = bytes2[i];


			// unsafe version
			int start_t = System.Environment.TickCount;
			for (int r=1; r<=repeats; r++)
			{
				bool res = CompareUnsafe(bytes1, bytes2);

				if (r == repeats)
					Console.WriteLine("Result: " + res);
			}
			int end_t = System.Environment.TickCount;
			Console.WriteLine("CompareUnsafe: {0} ms.", (end_t-start_t));

			// safe version
			start_t = System.Environment.TickCount;
			for (int r=1; r<=repeats; r++)
			{
				bool res = CompareSafe(bytes1, bytes2);

				if (r == repeats)
					Console.WriteLine("Result: " + res);
			}
			end_t = System.Environment.TickCount;
			Console.WriteLine("CompareSafe: {0} ms.", (end_t-start_t));
		}

		public static bool CompareSafe(byte[] byteArray1, byte[] byteArray2)
		{
			if (byteArray1.Length != byteArray2.Length)
				return false;

			for (int i=0; i<byteArray1.Length; i++)
				if (byteArray1[i] != byteArray2[i])
					return false;

			return true;
		}

		public unsafe static bool CompareUnsafe(byte[] byteArray1, byte[] byteArray2)
		{
			if (byteArray1.Length != byteArray2.Length)
				return false;

			if (byteArray1.Length % 4 != 0)
				throw new ArgumentException("Byte arrays have to be divisible by 4", "bytearray");

			fixed (byte* bytes1 = &(byteArray1[0]))
			fixed (byte* bytes2 = &(byteArray2[0]))
			{
				int* ints1 = (int*)bytes1;
				int* ints2 = (int*)bytes2;
				int size = byteArray1.Length / 4;
				for (int i=0; i<size; i++)
					if (ints1[i] != ints2[i])
						return false;

			}

			// all comparisons succeeded
			return true;
		}

		public static byte[] randomBytes(int size)
		{
			Random r = new Random();
			byte[] bytes = new byte[size];
			r.NextBytes(bytes);

			return bytes;
		}
	}
}

int cust_search = Int32.Parse(txt_custsearch.Text);
ds_customer.Tables["Customer_table"].DefaultView.RowFilter = "CustomerID = " + cust_search.ToString();

<br />
cust_name_search = txt_custname_search.Text + "%";<br />
dataview_cust_search.RowFilter = "cust_name LIKE " + cust_name_search;<br />

<br />
string CustomerID = "'" + txt_customerid.Text + "%'";<br />
dataview_cust_search.RowFilter = "CustomerID LIKE " + CustomerID;<br />