Question

I have a TextBox and want to delete lines if line before = line after.

I have Text like that:

Ab cd ...

Ef Gss ...
EE oo ...
EE oo ... // delete this line
qq ss ff

ok ee ..

I tried with many codes but it removed me all same lines. I just want to remove next same line. Empty lines should be always there.

Code I used:

richTextBox1.Text = string.Join( Environment.NewLine, richTextBox1.Lines.Distinct()); 

Or:

for (int tx = 0; tx < richTextBox1.Text.Length; tx++)
        {
            for (int tx1 = tx + 1; tx1 < richTextBox1.Text.Length; tx1++)
            {
                if (richTextBox1.Lines[tx] == richTextBox1.Lines[tx1])
                   // something like  richTextBox1.Lines[tx1].RemoveAt(tx1);
            }
        }

Answer 1

Try this –

      string[] temp = richTextBox1.Lines;
      for (int i= 0; i< richTextBox1.Lines.Length - 1; i++)
      {
          if (richTextBox1.Lines[i] == richTextBox1.Lines[i+ 1]
               && rt.Lines[i] != String.Empty)
          {
              temp[i] = null;
          }
      }
      richTextBox1.Lines = temp.Where(a => a != null).ToArray();