Hi
You can simply use " ".
look at following example
string mystring = "Webline";
here mystring is a string variable with initial value Webline
in the second line of code I have added a space as follows
mystring = mystring + " ";
so it will add a space and actual value of variable my string will be "Webline ".
again I did concatenation string
mystring = mystring + "DotNet";
Console.WriteLine(mystring);
Console.ReadLine();
so final output is
"Weblineindia DotNet"
you can find the space in output after Webline.