C # finds all positions of a character in a string

When you find all the positions of a character in a string, you can first convert the string to an array of type char by using the ToCharArray method, and then iterate through the array, removing its position if the value in the array is the same as the character you are looking for. Find the implementation code for a character in all positions in the string as follows:

private void Button1_Click (object sender, EventArgs e)
         {
             String str = TextBox1.Text.Trim ();
             char[] MyChar = str. ToCharArray ();
             for (int i = 0; i < mychar.length; i++)
             {
                 if (mychar[i). ToString () = = TextBox2.Text.Trim ())
                     MessageBox.Show ("string" + TextBox2.Text.Trim () + "in" + TextBox1.Text.Trim () + "position is:" + i.tostring () + "\ n");
             }
         }