read text and found rank(space)

[Smurfas]

char inputString;
int i;
inputString = tr.ReadLine();
while (inputString != null )
{
    inputString = tr.ReadLine(); //ascribable text
    if (inputString == ' ') { i++;} //i - how many rank(space)
 }

What's wrong? Why I get error about char convert to string...
And why wrong this: (inputString == ' ')

Thnaks for answer

[Curtis Rutland]

Please use code tags, not quote tags when posting. Thanks.

MODERATOR.

Now then...

You haven't shown us the definition of tr but I'll guess that it is a TextReader.

Your problem is that tr.ReadLine() returns a string. ReadLine() returns a string that contains all the characters up to the end of the line. Even if there is only one character on the line, it will still be a string. You have defined inputString as a char. So, without a cast, that will fail.