How to validate and focus each text box alone

Question

- i have two Texbox (1)Name, (2)Code. i want to validate each textbox alone but the code didn't work. every time show the first messagebox when i repeat Name OR Code 

 

Code:- 

 

if (dt.Rows.Count > 0 || dt2.Rows.Count > 0)

{

  if (dt.Rows.Count > 0)

  {

    MessageBox.Show("this Name was inserted !", "Warning ", MessageBoxButtons.OK,          MessageBoxIcon.Warning);

    txt_Name.Focus();

    txt_Name.SelectionStart = 0;

    txt_Name.SelectionLength = txt_Name.TextLength;

    return;

  }

  else if (dt2.Rows.Count > 0)

  {

    MessageBox.Show("That Code was inserted !", "Warning ", MessageBoxButtons.OK,          MessageBoxIcon.Warning);

    txt_Code.Focus();

    txt_Code.SelectionStart = 0;

    txt_Code.SelectionLength = txt_Code.TextLength;

    return;

  }

}