C# program to print the star diamond pattern
Program.cs
int i, j;
for (i = 1; i <= 7; i++)
{
    for (j = 1; j <= 7 - i; j++)
    {
        Console.Write(" ");
    }
    for (j = 1; j <= i; j++)
    {
        Console.Write("* ");
    }
    Console.Write("\n");
}
for (i = 6; i >= 1; i--)
{
    for (j = 1; j <= 6 - i; j++)
    {
        Console.Write(" ");
    }
    for (j = 1; j <= i; j++)
    {
        Console.Write(" *");
    }
    Console.Write("\n");
}
Output
kodingwindow@kw:~/csharp$ dotnet run
      * 
     * * 
    * * * 
   * * * * 
  * * * * * 
 * * * * * * 
* * * * * * * 
 * * * * * *
  * * * * *
   * * * *
    * * *
     * *
      *
kodingwindow@kw:~/csharp$
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