Parameter Array in asp.net

Parameter Array
Parameter arrays allow a variable number of arguments to be passed into a function member. The definition of the parameter has to include the params modifier, but the use of the parameter has no such keyword. A parameter array has to come at the end of the list of parameters, and must be a single-dimensional array. When using the function member, any number of parameters (including none) may appear in the invocation, so long as the parameters are each compatible with the type of the parameter array. Alternatively, a single array may be passed, in which case the parameter acts just as a normal value parameter. For example:
void ShowNumbers (params int[] numbers)
{
foreach (int x in numbers)
{
Console.Write (x+" ");
}
Console.WriteLine();
}
...

int[] x = {1, 2, 3};
ShowNumbers (x);
ShowNumbers (4, 5);
Output:
1 2 3
4 5

private string Concatenate(string separator, params object[] parts)
{
System.Text.StringBuilder buffer = new System.Text.StringBuilder();
string sepValue = "";
foreach (object o in parts)
{
buffer.AppendFormat("{0}{1}", sepValue, o);
sepValue = separator;
}
return buffer.ToString();
}