How to create database on button click

 private void button1_Click(object sender, EventArgs e)
        {
SqlConnection con = new SqlConnection("Data Source=yourservername;Persist Security Info=True;UserID=youruserID;Password=yourpassward");

            con.Open();
            string   str = "CREATE DATABASE pravinCheck";
            SqlCommand myCommand = new SqlCommand(str, con);

            myCommand.ExecuteNonQuery();

            MessageBox.Show("DB created....!!!");

        }

    You can set  other properties of database accoerding to you need by just editing query. 

    if you want, you can take database name dynamically from textbox or somthing....n create query will like

           string   str = "CREATE DATABASE "+textBox1.Text;

Thanx,Hope it will help you,

Pravin.