C# .NET - problem with passing values to char array

hi every one,

here iam having the problem about charecter array.

In C Language he used pass the values as bellow

public unsafe struct x25data
{
char xd_data[];
int xd_len;
}

but here he is passing values as follows

x25data.xd_data[0]=0x42;
x25data.xd_data[1]=0x07;
x25data.xd_data[2]=0x07;

how can we pass the same values in C#.net.

can we pass them as he passed in c.

help me in this please.