How to create a text file in C# ?

File.WriteAllText("D:\\as.txt", "welcome");

File.Create("D:\\Yourfile.txt");

using System.IO;

//this code segment write data to file.
FileStream fs1 = new FileStream("D:\\Yourfile.txt", FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter writer = new StreamWriter(fs1);
writer.Write("Hello Welcome");
writer.Close();

//this code segment read data from the file.
FileStream fs2 = new FileStream("D:\\Yourfile.txt", FileMode.OpenOrCreate, FileAccess.Read);
StreamReader reader = new StreamReader(fs2);
textBox1.Text = reader.ReadToEnd();
reader.Close();

string path = @"C:\mytesttext.txt";
string text2write = "Hello World!";

System.IO.StreamWriter writer = new System.IO.StreamWriter(path);
writer.Write(text2write);
writer.Close();