C# + max char frequency in string

//return the character that appears the maximum number of times in the string
//contain only ASCII characters, from the ranges ('a'-'z','A'-'Z','0'-'9'), and case sensitive
//If there is a tie in the maximum number of times a character appears in the string, return the character that appears first in the string 

public static void Main(string[] args)
{
  CharCounter("This is a neat day for Things about Coding9999");        
}
public static void CharCounter(string str) 
{
    string strValidated = "";
    str = str.Replace(" ", "");     //Remove all spaces

  //Validate alpha-numberic only
    if (Regex.IsMatch(str, @"^[A-Za-z0-9]+$")) strValidated = str;
    else throw new FormatException("--------> Only Apha Numeric values allowed");

    Dictionary<char, int> dict = new Dictionary<char, int>();

    foreach (char c in strValidated)    //Create Dictionary
    {
      if (dict.ContainsKey(c)) dict[c] = dict[c] + 1;
      else dict.Add(c, 1);
    }
  //Sort(K,V) by Highest Values
    var ordered = dict.OrderByDescending(x => x.Value)
      .ToDictionary(d => d.Key, d => d.Value);

  //var singleEntryDict = ordered.First();  
    var result = ordered.Take(1)
      .ToDictionary(d => d.Key, d => d.Value);

    foreach (var item in result.Keys)
    {
      Console.WriteLine($"Key= {item} : Value= {result[item]}");
    }
            
}

Similar codes

1 vote244 views1 answer
Remove last instance of string c#
C#
0 vote226 views1 answer
Alpahbet incremnet in c#
C#
0 vote293 views1 answer
Unknown discriminator value mongodb
C#
33 votes247 views4 answers
How to reload current scene unity
C#Unity
0 vote251 views1 answer
Select distinct linq mvc
C#
0 vote231 views1 answer
Block wapalyzer from detecting codeigniter
C#
0 vote275 views1 answer
How to concatenate two arrays
C#
27 votes262 views2 answers
Unity check if gameobject is active
C#Unity
1 vote240 views1 answer
Moq raise event
C#
0 vote233 views1 answer
Internal working of ioc container c#
C#