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this.dataGridView2.AutoGenerateColumns = true;
SqlConnection projectconn = new SqlConnection(connstring);
string sqlstr2 = "select project_group,project_name from project";
SqlDataAdapter projectadapter = new SqlDataAdapter(sqlstr2, projectconn);
DataSet rdset = new DataSet();
projectadapter.Fill(rdset);
dataGridView2.DataSource = rdset.Tables[0];