not all code paths return a value

[hailua]

[code=vbnet]
using System;
using System.Data;
using System.Data.Sql Client;
using System.Data.Sql Types;
using Microsoft.SqlSe rver.Server;
using System.Collecti ons;

public partial class UserDefinedFunc tions
{
[Microsoft.SqlSe rver.Server.Sql Function(FillRo wMethodName="Ob j_Row",
IsDeterministic =true,
IsPrecise=true,
TableDefinition ="ObjID int,OjbDataID int,ObjDataValu e nvarchar(400)",
DataAccess= DataAccessKind. Read)]

public static IEnumerable Obj_IDs(SqlInt3 2 Data_1, SqlInt32 Data_2, SqlInt32 Data_3)
{
using (SqlConnection conn = new SqlConnection(" context connection=true "))
{
try
{
if (!Data_2.IsNull )
{
string sql = @"Select Obj_ID, Obj_Data_ID, Obj_Data_Value from tbl_Obj_2";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataAdapter da = new SqlDataAdapter( cmd);
DataTable dt = new DataTable();
da.Fill(dt);
conn.Open();
return dt.Rows;
}
// if (!Data_3.IsNull )
//{
// string sql = @"Select Obj_ID, Obj_Data_ID, Obj_Data_Value from tbl_Obj_3";
// SqlCommand cmd = new SqlCommand(sql, conn);
// SqlDataAdapter da = new SqlDataAdapter( cmd);
// DataTable dt = new DataTable();
// da.Fill(dt);
// conn.Open();
// return dt.Rows;
//}
}
catch (Exception ex)
{
ex.Message.ToSt ring();
}
finally
{
conn.Close();
}

}

}
public static void Obj_Row(Object item, out int ObjID, out int ObjDataID, out string ObjDataValue)
{
DataRow row = (DataRow)item;
ObjID = Convert.ToInt32 (row["Obj_ID"]);
ObjDataID = Convert.ToInt32 (row["Obj_Data_I D"]);
ObjDataValue = row["Obj_Data_Value "].ToString();
}

};[/code]

Error 1 'UserDefinedFun ctions.Obj_IDs( System.Data.Sql Types.SqlInt32, System.Data.Sql Types.SqlInt32, System.Data.Sql Types.SqlInt32) ': not all code paths return a value

I'm newbie. Please, show me how to correct the problem. I did look some discussion in here say I have to return some thing in catch or finally. I'm some kind of stupid. so I'm still not understand why? and how?. Thank you.

[hailua]

code use C# tag. I solve the problem with ==>Else. Thanks for reading my post.