C# way to add item in specific position

I have string array which contains data like,

string[] temp = new();
temp[0] = "abc";
temp[1] = "mno";
temp[2] = "xyz";

I need the output like,
i need store value in specific variable

ex,

string value1 = "abc";
string value2 = "mno xyz"

so in another string i want the combine data of index 1 and 2.

Try using String.Format();

In your case it would look like this:

string value2 = String.Format("{0} {1}", temp[1], temp[2]);

// Another way of doing this:
string value2 = $"{temp[1]} {temp[2]}";

You can read more about it here: String.Format() Microsoft Documentation

If you want to join all items of the array into the string you can use:

string allElementsCombined = String.Join(' ', temp);

This will combine all strings from temp and add space character between them.

You can read more about this here: String.Join() Microsoft Documentation

Just add all string you want

string sum = temp[1] + " " + temp[2];

> To concatenate string variables, you can use the + or += operators, string interpolation or the String.Format, String.Concat, String.Join or StringBuilder.Append methods. The + operator is easy to use and makes for intuitive code. Even if you use several + operators in one statement, the string content is copied only once

https://learn.microsoft.com/en-us/dotnet/csharp/how-to/concatenate-multiple-strings

To combine array values into a string you can simply do the following:

string[] temp = new();
temp[0] = "abc";
temp[1] = "mno";
temp[2] = "xyz";

string value1 = temp[0];
string value2 = String.Format("{0} {1}",temp[1], temp[2]);

string[] temp = new string[] { "abc", "mno", "xyz" };
string value1 = temp[0];
string value2 = string.Join(" ", temp.Skip(1));
Console.WriteLine("value1 = " + value1);
Console.WriteLine("value2 = " + value2);

The Skip(1) method is used to skip the first element (i.e., "abc") and return the remaining elements as an IEnumerable<string>. Then, the string.Join() method is used to join the elements with a space separator, resulting in the string "mno xyz". Finally, the value1 and value2 variables are assigned the appropriate values, and their values are printed to the console.