string sql_select = "select * from canshu ";
conn = new System.Data.SqlClient.SqlConnection(connStr); //进行连接
myAdapter = new System.Data.SqlClient.SqlDataAdapter(sql_select, conn);
myDataSet.Clear();
myAdapter.Fill(myDataSet, "表1");
textBox_changdu1.Text =myDataSet .Tables["表1"].Rows[0][0].ToString();