datatable retreiving first record of the database

Question

I am performing search operation based on id which is auto incremented when I enter id as 0 it is retrieving data which is having id 1.

 

This is the search method

public DataTable Search(int code=0)
{
SqlConnection con = sqlConnection; String Query = "Select * from person" + (code > 0 ? " where code =" + code : "");
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(Query, con);
{
DataTable dataTable = new DataTable("Temp");
sqlDataAdapter.Fill(dataTable);
con.Close();
return dataTable;
}
}

This is search button code

private void btnSearch_Click(object sender, EventArgs e)
{
if(txtSearchCode.Text.Length>0)
{
DataTable dataTable = new SqlHelper().Search(int.Parse(txtSearchCode.Text));
if(dataTable.Rows.Count>0)
{
try
{
txtCode.Text = dataTable.Rows[0]["code"].ToString();
txtFirstname.Text = dataTable.Rows[0]["firstname"].ToString();
txtLastname.Text = dataTable.Rows[0]["lastname"].ToString(); var a = dataTable.Rows[0]["gender"].ToString() == "Male" ? rbnMale.Checked = true : rbnFemale.Checked = true;
txtMobile.Text = dataTable.Rows[0]["mobile"].ToString();
dtpDOB.Text = dataTable.Rows[0]["dob"].ToString();
txtAge.Text = dataTable.Rows[0]["age"].ToString();
chkStatus.Checked = dataTable.Rows[0]["status"].ToString() == "active"? true :false;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
else
{
MessageBox.Show("No Data Found");
}
}
else
{
MessageBox.Show("Please Enter Code");
}
}