Drop down box data show

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C#4.0

Hi, I have coded the following for loading the data of access in the drop down box and then show in the text boxes if selected from box but I am not getting data in the drop down box, pl help

What I have tried:

con.Open();
mycmd = new OleDbCommand("select * from marksheet", con);
OleDbDataReader myread;
myread = mycmd.ExecuteReader();
while (myread.Read())
{textBox1.Text = myread[0].ToString();}
con.Close();