Why does my label under the textbox is visible?

private bool IsFilled()

{

if (TextBox1.Text == "" || TextBox3.Text == "" || TextBox4.Text == "" || TextBox5.Text == "" )

{

if (TextBox1.Text == "")

{

lblrn.Visible = true;

}

else

lblrn.Visible = false;

{

}

if (TextBox3.Text == "")

{

lbllocal.Visible = true;

}

else

lbllocal.Visible = false;

{

}

if (TextBox4.Text == "")

{

lblCN.Visible = true;

}

else

lblCN.Visible = false;

{

}

if (TextBox5.Text == "")

{

lblWS.Visible = true;

}

else

lblWS.Visible = false;

{

}

return true;

}

else

{

lblrn.Visible = false;

lbllocal.Visible = false;

lblCN.Visible = false;

lblWS.Visible = false;

return false;

}

}

protected void btnsubmit_Click(object sender, EventArgs e)

{

if (IsFilled())

{

lblrn.Visible = false;

lbllocal.Visible = false;

lblCN.Visible = false;

lblWS.Visible = false;

}

else

{

Con.Open();

cmd = new SqlCommand("INSERT INTO Trans_Request ([Requestor_LName],[Local],[Computer_Name],[Work_Schedule],[Date_Created],[Work_Station],[Business_Group])VALUES (@Requestor_LName,@Local,@Computer_Name,@Work_Schedule,@Date_Created,@Work_Station,@Business_Group)", Con);

//string sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm:ss.fff");

cmd.Parameters.AddWithValue("@Requestor_LName", TextBox1.Text);

cmd.Parameters.AddWithValue("@Local", TextBox3.Text);

cmd.Parameters.AddWithValue("@Computer_Name", TextBox4.Text);

cmd.Parameters.AddWithValue("@Work_Schedule", TextBox5.Text);

cmd.Parameters.AddWithValue("@Date_Created", TextBox2.Text);

cmd.Parameters.AddWithValue("@Work_Station", TextBox6.Text);

cmd.Parameters.AddWithValue("@Business_Group", TextBox7.Text);

cmd.ExecuteNonQuery();

Con.Close();

ClearTextBox();

//end

}

}

 

 even if my declaration is already on a false statement?