How to validate and focus each text box alone

- 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;

}