合并DataTable

DataTable dt3 = dt1.Clone();
for(inti = 0;i < dt2.Columns.Count;i++)
{
dt3.Columns.Add(dt2.Columns[i].ColumnName);
}
object[] obj =
new object[dt2.Columns.Count];
for(inti = 0;i< dt1.Rows.Count;i++)
{
dt1.Rows[i].ItemArray.CopyTo(obj,0);
dt3.Rows.Add(obj);
}

if (dt1.Rows.Count>= dt2.Rows.Count)
{
for (inti = 0; i < dt2.Rows.Count;i++)
{
for (intj = 0; j < dt2.Columns.Count;j++)
{
dt3.Rows[i][j+ dt1.Columns.Count]= dt2.Rows[i][j].ToString();
}
}
}
else
{
DataRow dr3;
for (inti = 0; i < dt2.Rows.Count- dt1.Rows.Count; i++)
{
dr3 = dt3.NewRow();
dt3.Rows.Add(dr3);
}
for (inti = 0; i < dt2.Rows.Count;i++)
{
for (intj = 0; j < dt2.Columns.Count;j++)
{
dt3.Rows[i][j+ dt1.Columns.Count]= dt2.Rows[i][j].ToString();
}
}
}