Simple! How to replace " in .NET with something...?
That won't work, should be @"\"" and the R should be uppercase
                  Robert Greiner
                   2010-09-16 17:56:14
                @Robert, you're right about the R, which I fixed, but not the @.
                  Matthew Flaschen
                   2010-09-16 17:57:49
                @Robert Greiner - The @ is not necessary
                  Jeremy
                   2010-09-16 17:58:43
                @Robert - with the @ you escape with double quotes instead: `Replace(@"""",//...`
                  Rudu
                   2010-09-16 17:59:24
                Right, my mistake.  I was thinking of Regex.
                  Robert Greiner
                   2010-09-16 18:00:43
                Nah...it's part of an answer.  But not extremely helpful, as it doesn't include any context.
                  cHao
                   2010-09-16 18:04:10
                
                +3 
                A: 
                
                
              
            Something like this:
var st = "String with \" in it.";
st.Replace('\"', 'c'); // replacement char
                  Nate Bross
                   2010-09-16 17:55:50
                
              Works in C#, but not in VB.  Pity the OP didn't bother to specify what *language* he was using, as the language is way more important than the platform.
                  cHao
                   2010-09-16 18:06:37
                
                +2 
                A: 
                
                
              I don't understand your question but if escape sequences are ones you are looking for.. in this case to escape " then for C# look here and for vb.net and comparison with C# look in the Strings 
section of this post.
                  Misnomer
                   2010-09-16 17:56:33
                
              
                +2 
                A: 
                
                
              
            You want to replace a double quote with something?
If you have a string variable:
string sMyText = ".....";
You could replace a double quote with something like this:
sMyText = sMyText.Replace("\"","x");
The slash character \ is an escape character, allowing you to use " inside a string.
                  Jeremy
                   2010-09-16 17:56:41
                
              Not sure why this was down-voted. It works perfectly as you will see if you run the code.
                  Steve Michelotti
                   2010-09-16 17:59:49
                Isn't he escaping the double quote? And so, we don't need the `@` or the double escaping.
                  Floyd Pink
                   2010-09-16 18:00:50
                @Steve: Well, I didn't downvote, but it *might* have been downvoted because you don't indicate in your answer that the code as written won't do anything (you'd have to assign the result to something, like `myString = myString.Replace("\"", "foo");`).
                  Dan Tao
                   2010-09-16 18:03:59
                No, `\"` is correct. It is that way in C-like languages to make your brain catch fire when you write string literals with quotes in them. `"My lady, I \"" + verb + "\" your dress!"`
                  Skurmedel
                   2010-09-16 18:04:15
                
                +3 
                A: 
                
                
              string newValue = "quote \"here\"".Replace("\"", "'");
Or
string newValue = @"quote ""here""".Replace(@"""", "'");
                  John Fisher
                   2010-09-16 17:57:10
                
              @Kobi: 5 quotes wouldn't work. - 1 quote starts the string, 2 quotes escapes and puts a quote into the string, and 1 quote closes the string.
                  John Fisher
                   2010-09-17 15:54:55
                @John Fisher - Oh, of course. I put 5 quotes by accident. I meant to say you forgot the `@` sign.
                  Kobi
                   2010-09-17 18:22:14
                
                +5 
                A: 
                
                
              Oh, you mean you want to replace all occurrences of the string " with something else?
Try this:
public static class EvilStringHelper {
    private static readonly Action<string, int, char> _setChar;
    private static readonly Action<string, int> _setLength;
    static EvilStringHelper() {
        MethodInfo setCharMethod = typeof(string).GetMethod(
            "SetChar",
            BindingFlags.Instance | BindingFlags.NonPublic
        );
        _setChar = (Action<string, int, char>)Delegate.CreateDelegate(typeof(Action<string, int, char>), setCharMethod);
        MethodInfo setLengthMethod = typeof(string).GetMethod(
            "SetLength",
            BindingFlags.Instance | BindingFlags.NonPublic
        );
        _setLength = (Action<string, int>)Delegate.CreateDelegate(typeof(Action<string, int>), setLengthMethod);
    }
    public static void ChangeTo(this string text, string value) {
        _setLength(text, value.Length);
        for (int i = 0; i < value.Length; ++i)
            text.SetChar(i, value[i]);
    }
    public static void SetChar(this string text, int index, char value) {
        _setChar(text, index, value);
    }
}
Usage:
"\"".ChangeTo("Bob");
string test = string.Concat("\"", "Hello!", "\"");
Console.WriteLine(test);
Output:
BobHello!Bob
Note: This was totally a joke.
                  Dan Tao
                   2010-09-16 18:00:08
                
              @Dan Tao - ooooh. That's even snarkier than my reply. It didn't even occur to me to go so far as to use delegates and reflection.
                  Joel Etherton
                   2010-09-16 18:02:12
                
                
                A: 
                
                
              char[] str = myString.ToCharArray();
StringBuilder newString = new StringBuilder("");
for(int i = 0;i<str.Length;i++)
{
    if('"'.Equals(str[i])) newString.Append(''); // put your new char here
    else newString.Append(str[i]);
}
myString = newString.ToString();
str = null;
// Don't use this method. This is really stupid. I just felt like being a little snarky.
                  Joel Etherton
                   2010-09-16 18:01:21