Remove Last Specific Character in a String C#

King King's answer is of course correct, and Tim Schmelter's comment is also good suggestion in your case.

But if you really want to remove the last comma in a string, you should find the index of the last comma and remove it like this:

string s = "1,5,12,34,12345";
int index = s.LastIndexOf(',');
Console.WriteLine(s.Remove(index, 1));

Output will be:

1,5,12,3412345

Here is a demonstration.

It is unlikely that you want this way but I want to point it out. And remember, the String.Remove method doesn't remove any characters in the original string, it returns new string.

Try string.Remove();

string str = "1,5,12,34,";
string removecomma = str.Remove(str.Length-1);
MessageBox.Show(removecomma);

Dim psValue As String = "1,5,12,34,123,12"
psValue = psValue.Substring(0, psValue.LastIndexOf(","))

output:

1,5,12,34,123

The TrimEnd method takes an input character array and not a string. The code below from Dot Net Perls, shows a more efficient example of how to perform the same functionality as TrimEnd.

static string TrimTrailingChars(string value)
{
    int removeLength = 0;
    for (int i = value.Length - 1; i >= 0; i--)
    {
        char let = value[i];
        if (let == '?' || let == '!' || let == '.')
        {
            removeLength++;
        }
        else
        {
            break;
        }
    }
    if (removeLength > 0)
    {
        return value.Substring(0, value.Length - removeLength);
    }
    return value;
}

Try below

Something..TrimEnd(",".ToCharArray());

Or you can convert it into Char Array first by:

string Something = "1,5,12,34,";
char[] SomeGoodThing=Something.ToCharArray[];

Now you have each character indexed:

SomeGoodThing[0] -> '1'
SomeGoodThing[1] -> ','

Play around it

When you have spaces at the end. you can use beliow.

ProcessStr = ProcessStr.Replace(" ", "");
Emails     = ProcessStr.TrimEnd(';');

Try this, string Something1= Something.Substring(0, Something.Length - 1 );