Basic String Operations in vb.net application [closed] - vb.net

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I wanted to design a vb.net program which finds the longest word from a string. With the help of other users i managed to do that and i added other string operations. Overall the program now counts the number of symbols, has word count, interval count, finds longest and shortest word and the average word size. I thought the code could help others who have the same issues with those operations like me so i posted it below.
Here is a image of the program: https://i.stack.imgur.com/KcPNa.png
This is how the final code looks:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim a As String = TextBox1.Text
Dim a1 As Integer = Len(a) ' string size
Dim a3 As String = a.Split(" ").Length - 1 ' interval count
Dim a4 As String = a.Split(" ").OrderByDescending(Function(j) j.Length).FirstOrDefault 'longest word
Dim a5 As String = a.Split(" ").OrderByDescending(Function(j) j.Length).LastOrDefault 'shortest word
Dim a6 As String = a.Split(" ").Average(Function(j) j.Length) 'average word count
TextBox2.Text = a1
TextBox4.Text = a3
TextBox3.Text = a3 + 1 'word count is just 1 more than interval count
TextBox5.Text = a4
TextBox6.Text = a5
TextBox7.Text = a6
End Sub

Answer 1

I can not provide an solution in vb but maybe my c# implementation will give you a hint.
string source = "some string";
string longest = string.empty;
foreach(string s in source.Split(' ')) {
if (s.Length > longest.Length) {
longest = s;
}
}
Console.WriteLine(longest);
Tip: Next Time it would be helpfull to ask more specific questions.