Not All Code Paths Return A Value

using System;

using System.Data;

using System.Data.SqlClient;

using System.Data.SqlTypes;

using Microsoft.SqlServer.Server;

using System.Collections;

public partial class UserDefinedFunctions

{ [Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName="Obj_Row",

IsDeterministic=true,IsPrecise=true,

TableDefinition="ObjID int,OjbDataID int,ObjDataValue nvarchar(400)",DataAccess= DataAccessKind.Read)]public static IEnumerable Obj_IDs(SqlInt32 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.ToString();

}

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_ID"]);ObjDataValue = row["Obj_Data_Value"].ToString();

}

};

//Error 1 'UserDefinedFunctions.Obj_IDs(System.Data.SqlTypes.SqlInt32, System.Data.SqlTypes.SqlInt32, System.Data.SqlTypes.SqlInt32)': not all code paths return a value

 

I'm newbie. Please, show me how to correct the problem. Thank you.