//获取数据库数据并填充一个DataTable
SqlConnection conn = new SqlConnection("连接数据库字符串");
SqlDataAdapter da = new SqlDataAdapter("SQL查询语句",conn);
conn.Open();
DataTable dt = new DataTable();
da.Fill(dt);
da.Dispose();
conn.Close();
conn.Dispose();
//把DataTable中的相关数据显示到界面中
this.textBox1.Text = dt.Rows["行"]["列"].ToString();
this.textBox2.Text = dt.Rows["行"]["列"].ToString();
this.textBox3.Text = dt.Rows["行"]["列"].ToString();
..........................

------解决方案--------------------
                    string Afile = "provider=microsoft.jet.OLEDB.4.0;Data source=" + name.into.nto("ServerPath") + "";
                   OleDbConnection AconnStr = new OleDbConnection(Afile);
                   OleDbCommand scmd = new OleDbCommand("select top 200 * from client where 字段='" + gainame + "' and 字段='" + comboBox3.Text.Trim() + "' order by id", AconnStr);
                   OleDbDataReader odr = null;
                   AconnStr.Open();
                   odr = scmd.ExecuteReader();
                   if (odr != null)
                   {
                       while (odr.Read())
                       {
                           textBox7.Text = odr["字段"].ToString();
                           textBox10.Text = odr["字段"].ToString();
                           textBox16.Text = odr["字段"].ToString();
                           textBox11.Text = odr["字段"].ToString();
                           textBox12.Text = odr["字段"].ToString();
                           textBox13.Text = odr["字段"].ToString();
                           textBox14.Text = odr["字段"].ToString();
                           textBox15.Text = odr["字段"].ToString();
                           comboBox3.Text = odr["字段"].ToString();
                       }
                       odr.Close();

------解决方案--------------------
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C# code
//获取数据库数据并填充一个DataTable
SqlConnection conn = new SqlConnection("连接数据库字符串");
SqlDataAdapter da = new SqlDataAdapter("SQL查询语句",conn);
conn.Open();
DataTable dt = new DataTable();
da.Fill(dt);
da.Dispose();
conn.Close();
conn.Dispose();
//把DataTable中的相关数据显示到界面中
this.textBox1.Text = dt.Rows["行"]["列"].ToString();
this.textBox2.Text = dt.Rows[…