how to merge two data set

// This is table one. 
    DataTable t1 = new DataTable(); 
    t1.Columns.Add("key1"); 
    t1.Columns.Add("c1"); 
    t1.PrimaryKey = new[]{t1.Columns["key1"]}; 
    t1.Rows.Add(1, "data1"); 
 

    // This is table two. 
    DataTable t2 = new DataTable(); 
    t2.Columns.Add("key1"); 
    t2.Columns.Add("c2"); 
    t2.PrimaryKey = new[] { t2.Columns["key1"] }; 
    t2.Rows.Add(1, "data2"); 
 

    // Combine table one with table two. 
    t1.Merge(t2, false, MissingSchemaAction.Add); 
 

    // Read "c2" field from table one 
    Response.Write(t1.Rows[0]["c2"].ToString());