find and hightlight text in texbox

Question

I am new c#. I try to a notepad.

But I can not create find function in my notepad. I want to find string and highlight it.

I used textbox, not used richtextbox for notepad.

thank you.

note : soryy for my bad english.

Alex Smith · Answer

go through this link http://stackoverflow.com/questions/17101889/how-to-create-find-in-notepad-in-c-sharp

ghasem deh · Answer

hi ... For textBoxt : private void findButton_Click ( object sender  EventArgs e ) { int count = 0 ; string keyword = keywordTextbox . Text . Trim (); //getting given searching string int startPosition = 0 ; //initializing starting position to search int endPosition = 0 ; int endArticle = articleRichTextbox . Text . Length ; //finding total number of character into the article for ( int i = 0 ; i endArticle ; i = startPosition ) //creating a loop until ending the article { if ( i == - 1 ) //if the loop goes to end of the article then stop { break ; } startPosition = articleRichTextbox . Find ( keyword  startPosition  endArticle  RichTextBoxFinds . WholeWord ); //using find method get the begining position when find the searching string if ( startPosition >= 0 ) //if match the string //if don't match the string then it return -1 { count ++; //conunting the number of occuerence or match the search string articleRichTextbox . SelectionColor = Color . Blue ; //coloring the matching string in the article endPosition = keywordTextbox . Text . Length ; startPosition = startPosition + endPosition ; //place the starting position at the next word of previously matching string to continue searching. } } if ( count == 0 ) //if the givn search string don't match at any time { MessageBox . Show ( No Match Found!!! ); } numberofaccurTextbox . Text = count . ToString (); //show the number of occurence into the text box } Link For richTextBox : private void button1_Click(object sender EventArgs e) { try { int count = 0; string keyword = textBox1.Text.Trim(); int startPosition = 0; int endPosition = 0; int endArticle = richTextBox1.Text.Length; for (int i = 0; i { if (i == -1) { break; } startPosition = richTextBox1.Find(keyword startPosition endArticle RichTextBoxFinds.WholeWord); if (startPosition >= 0) { count++; richTextBox1.SelectionBackColor = Color.PaleGoldenrod; endPosition = textBox1.Text.Length; startPosition = startPosition + endPosition; } } if (count == 0) { MessageBox.Show(???? ???? ??? ???? ???FindMessageBoxButtons.OKMessageBoxIcon.Information); } MessageBox.Show(????? :  + count +  ???? ???? ?? Find MessageBoxButtons.OK MessageBoxIcon.Information); } catch { MessageBox.Show(????? ?? ???? ? ???? ????? ???? ????ErrorMessageBoxButtons.OKMessageBoxIcon.Warning); } } private void textBox1_MouseClick(object sender MouseEventArgs e) //search textBox { int count = 0; string keyword = textBox1.Text.Trim(); int startPosition = 0; int endPosition = 0; int endArticle = richTextBox1.Text.Length; for (int i = 0; i { if (i == -1) { break; } startPosition = richTextBox1.Find(keyword startPosition endArticle RichTextBoxFinds.WholeWord); if (startPosition >= 0) { count++; richTextBox1.SelectionBackColor = Color.Azure; endPosition = textBox1.Text.Length; startPosition = startPosition + endPosition; } } } }