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string find = "select distinct casing1 from 1";
string connStr = "server=localhost;uid=root;pwd=1;database= design";
MySQLConnection myConnection = new MySQLConnection(connStr);
MySQLDataAdapter myda = new MySQLDataAdapter(find, myConnection);
DataSet ds = new DataSet();
myConnection.Open();
myda.Fill(ds);
myConnection.Close();
comboBox1.DataSource = ds.Tables[0].DefaultView;
comboBox1.DisplayMember = "casing1";