Use FileUpload control and create a folder in your appliction as in example Uploads1 and use this method
protected void btnSub_Click(object sender, EventArgs e)
{
try
{
string filename = FileUpload1.FileName;
FileUpload1.PostedFile.SaveAs(Server.MapPath("~\\Uploads1\\" + filename));
string path = "~\\Uploads1\\" + filename;
SqlConnection con = new SqlConnection(str);
lblinfo.Text = " uploaded successfully ";
cmd = new SqlCommand("Insert into news(headline,publication,edition,date,url) values(@head,@publication,@edition,@date,'" + path + "')", con);
cmd.Parameters.AddWithValue("head", TextBox1.Text);
cmd.Parameters.AddWithValue("publication", TextBox2.Text);
cmd.Parameters.AddWithValue("edition", TextBox3.Text);
cmd.Parameters.AddWithValue("date", TextBox4.Text);
cmd.CommandType = CommandType.Text;
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}
}