Compiler Error CS0119 plz help

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SQL

.NET

This is my code in the login click button as Sir suggested:

private void btnLogin_Click(object sender, EventArgs e)
{
AppDatabase1DataSet ds = new AppDatabase1DataSet ();
AppDatabase1DataSet .LoginDataTable dt = new AppDatabase1DataSet.LoginDataTable ();
AppDatabase1DataSet.LoginDataTable();
this.loginTableAdapter1 .Fill (dt) ;
foreach (DataRow dr in dt .Rows )
    {
      if(dr[0].ToString()==txtuname .Text && dr[1].ToString()== txtpassword.Text )
    {
      txtpassword.Text = "";
      txtpassword.Text = dr[0].ToString();
      MessageBox.Show("Login Succeeded");
    }

I've defined everythings accordingly but this error pops up on the LoginDataTable() line:

Error 1 'csharp_phonebk.AppDatabase1DataSet.LoginDataTable' is a 'type', which is not valid in the given context

I don't know why...Please answer me asap.