I'm trying to count the occurrence of a single digit to that in a string. What I mean by this is The user types in a sentence in a multi line TextBox and below in a separate text field a single letter. I need to check how many times that single letter occurs in the sentence.
Currently, I have the input of the two text fields by using this
string InputSingleline = SingleLineTxtBox.Text;
string InputMultiline = MultiLineTxtBox.Text;
And I'm trying to count the occurance of input in InputSingleLine in MultiLineTxtBox by using this but it does not work.
int Count = InputMultiline.Count(f => f == SingleLineTxtBox);
Firstly you should count the occurrences of InputSingleline instead of SingleLineTxtBox since you have already set the InputSingleline to SingleLineTxtBox.Text. And secondly the InputSingleline is a string with one character, so you need to use something like FirstOrDefault to return that character from this string:
int Count = InputMultiline.Count(f => f == InputSingleline.FirstOrDefault());
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