All ways show this error "Confirm Password Not Matching With

Question

private void button1_Click(object sender, EventArgs e)

{

if (txtFirstName.Text == "" || txtUserName.Text == "" || txtPassword.Text == "" || txtConfirPassword.Text == "")

{

MessageBox.Show("Not Allowed Empty Field", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

return;

}

if (string.IsNullOrEmpty(txtPassword.Text) && string.IsNullOrEmpty(txtPassword.Text) && txtPassword.Text.Equals(txtConfirPassword.Text))

{

int i = 0;

SqlCommand cmd = con.CreateCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "select * from tblAddUser where UserName='" + txtUserName.Text + "'";

cmd.ExecuteNonQuery();

DataTable dt = new DataTable();

SqlDataAdapter da = new SqlDataAdapter(cmd);

da.Fill(dt);

i = Convert.ToInt32(dt.Rows.Count.ToString());

if (i == 0)

{

SqlCommand cmd1 = con.CreateCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "insert into tblAddUser values('" + txtFirstName.Text + "','" + txtLastName.Text + "','" + txtUserName.Text + "','" + txtPassword.Text + "','" + txtConfirPassword.Text + "')";

cmd.ExecuteNonQuery();

MessageBox.Show("Sucess");

return;

}

else

{

MessageBox.Show("User Name Is Already Exits");

return;

}

}

else

{

MessageBox.Show("Confirm Password Not Matching With Password");

// return;

}