C# SQL Columns into ComboBox

My SQL query isn't dropping anything into the combobox. The connection seems to be made but the while loop doesn't seem to work. Can anybody tell me what it wrong?

string sqltable = ("dbo.SLTDS_C"+id+"_table");  

SqlConnection con = new SqlConnection("Data Source=" + server   + ";Initial Catalog=" + database + ";Integrated Security=" + security);  
con.Open();  

string sqldatapull = ("select name from syscolumns where id = object_id('" + sqltable + "') order by name asc");
SqlCommand cmd = new SqlCommand(sqldatapull, con);
cmd.CommandType = CommandType.Text;
SqlDataReader dr = cmd.ExecuteReader();

while (dr.Read())  
{  
    sqldatapull = dr[0].ToString();  
    comboBox1.Items.Add(sqldatapull);  
}  

dr.Close();  
con.Close();  

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Correction code:
string sqldatapull = ("select name from syscolumns where id = object_id('" + sqltable + "') order by name asc");

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It's because you're including dbo. as part of the table name. If you run

SELECT * FROM INFORMATION_SCHEMA.COLUMNS

You will see that the table names have no schema in the TABLE_NAME column.

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