Check If Value Exists in DB - asp.net

Question

I am trying to check if value exists in DB and trying to 'out' it to a var.
and cannot get it to turn into a 1...
here is my code to check.
if(!sqlUtil.Check_Person_Exists(txt_FirstName.Text.Trim(),txt_Surname.Text.Trim()))
{
// Insert
// ======
sqlUtil.Insert_person(obj);
// Redirect
// ========
Response.Redirect("Default.aspx");
}
else
{
txt_FirstName.BackColor = Color.FromName(ConfigurationManager.AppSettings["ErrorColour"]);
txt_Surname.BackColor = Color.FromName(ConfigurationManager.AppSettings["ErrorColour"]);
lbl_message.Text = " * '" + txt_FirstName.Text + " " + txt_Surname.Text +
"' already Exists!";
}
Here is the Check Method.
public Boolean Check_Person_Exists(String Fname, String Lname)
{
// Init()
// ======
SqlConnection conn = null;
SqlDataReader rdr = null;
SqlCommand cmd = null;
var iPerson = 0;
var bPerson = false;
try
{
// Config
// -------
conn = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
conn.Open();
cmd = new SqlCommand("[sp_Check_Person_Exists]", conn);
cmd.CommandType = CommandType.StoredProcedure;
// Param(s)?
// ---------
cmd.Parameters.Add("#s_FirstName", SqlDbType.NVarChar, 50).Value = Fname;
cmd.Parameters.Add("#s_Surname", SqlDbType.NVarChar, 50).Value = Lname;
// Execute
// -------
rdr = cmd.ExecuteReader();
// Row(s)?
// -------
if (rdr.HasRows)
{
// Read
// ----
while (rdr.Read())
{
// Something there?
// ----------------
if (rdr["FirstName"].ToString() !=string.Empty)
{
// Valid?
// ------
Int32.TryParse(rdr["FirstName"].ToString(), out iPerson);
if(iPerson > 0)
{
// Exists
// ------
bPerson = true;
}
}
}
}
// Clean up / close down
// ---------------------
cmd.Dispose();
rdr.Dispose();
rdr.Close();
conn.Dispose();
conn.Close();
}
catch (SqlException ex)
{
throw ex;
}
finally
{
// Clean up / close down
// ---------------------
if (cmd != null)
{
cmd.Dispose();
}
if ((rdr != null) && (!rdr.IsClosed))
{
rdr.Close();
}
if ((conn != null) && (conn.State != ConnectionState.Closed))
{
conn.Dispose();
conn.Close();
}
}
// Return
// ======
return bPerson;
}
}
On the // Valid?
Check i am trying to out to the iPerson and this is where it fails and won't populate the iPerson.
Here is my Stored Procedure.
ALTER PROCEDURE [dbo].[sp_Check_Person_Exists]
#s_FirstName nvarchar(50),
#s_Surname nvarchar(50)
AS
BEGIN
SELECT FirstName, Surname
FROM tbl_person
WHERE (FirstName = #s_FirstName) AND (Surname = #s_Surname)
END
I am assigning my variables and all this works ok but just wont populate the iPerson..

Answer 1

You're trying to parse the person's FirstName into an Int32? You'll have to query the ID and parse that into the iPerson.