Insert value into a string at a certain position

Question

i m looking to place a value from a text box lets say  12  to a certain place in a string temp variable  Then I want to place another value after that say  10  but with a   in between like a time  Both come from Text boxes and are validated so they can only be numbers

User · Accepted Answer

You can t modify strings  they re immutable  You can do this instead   txtBox Text   txtBox Text Substring 0  i     TEXT    txtBox Text Substring i

User · Answer

If you just want to insert a value at a certain position in a string  you can use the String Insert method   public string Insert int startIndex  string value    Example     abc  Insert 2   XYZ       abXYZc

User · Answer

If you have a string and you know the index you want to put the two variables in the string you can use   string temp   temp Substring 0 index    textbox1 Text         textbox2 Text  temp Substring index     But if it is a simple line you can use it this way   string temp   string Format  your text goes here  0  rest of the text goes here    1    textBox1 Text   textBox2 Text

User · Answer

var sb   new StringBuilder    sb Append beforeText   sb Insert 2  insertText   afterText   sb ToString

[c#] Insert value into a string at a certain position?

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