您需要定义数据表在表单级别然后在点击链接，你可以这样做：

 私人无效button_Click（对象发件人，EventArgs五）
 {
的DataRow NEWROW = table.NewRow（）; 
 table.Rows.Add（NEWROW）; 
的GridView .DataSource =表; //指定源
} 
 

有关在表单级别定义表

 的DataTable表; //在数据表形式层面

私人数据表CREATETABLE（）
 {
表=新的DataTable（）; //这里insntianting窗体级别表。 
 table.Columns.Add（姓名的ToString（））; 
 table.Columns.Add（大小的ToString（））; 
的DataRow博士= table.NewRow（）; 
博士[名称] =迈克; 
的DataRow DR2 = table.NewRow（）; 
 DR2 [名称] =瑞恩; 
的DataRow DR3 = table.NewRow（）; 
 DR3 [名称] =泰勒; 
博士[大小] =一; 
 DR2 [大小] =二; 
 table.Rows.Add（DR）; 
 table.Rows.Add（DR2）; 
 table.Rows.Add（DR3）; 
返回表; 
 //和我的构造我设置gridview.DataSource =数据表; 
} 
 

I have on a usercontrol a datagridview. I created a datatable and I set the source of datagrid to be this datatable. I want,at runtime,to be able to add how many rows on gridview I want at every button click.

My code :

 private DataTable CreateTable()
    {
        Datatable table=new Datatable();
        table.Columns.Add("Name".ToString());
        table.Columns.Add("Size".ToString());
        DataRow dr = table.NewRow();
        dr["Name"] = "Mike";
        DataRow dr2 = table.NewRow();
        dr2["Name"] = "Ryan;
        DataRow dr3 = table.NewRow();
        dr3["Name"] = "Taylor";
        dr["Size"] = " one";
        dr2["Size"] = "two";
        table.Rows.Add(dr);
        table.Rows.Add(dr2);
        table.Rows.Add(dr3);
        return table;
     //and on my constructor I set gridview.DataSource=Datatable;
    }

 //Code  on the event:
 private void button_Click(object sender, EventArgs e)
    {

        DataRow NewRow = table.NewRow();
        table.Rows.Add(NewRow);
    }

You need to define the DataTable at form level. Then in button click you can do:

private void button_Click(object sender, EventArgs e)
{
    DataRow NewRow = table.NewRow();
    table.Rows.Add(NewRow);
    gridview.DataSource=table; //specify the source
}

For defining table at form level:

DataTable table; //DataTable at form level

private DataTable CreateTable()
{
    table=new Datatable(); //here insntianting the form level table. 
    table.Columns.Add("Name".ToString());
    table.Columns.Add("Size".ToString());
    DataRow dr = table.NewRow();
    dr["Name"] = "Mike";
    DataRow dr2 = table.NewRow();
    dr2["Name"] = "Ryan;
    DataRow dr3 = table.NewRow();
    dr3["Name"] = "Taylor";
    dr["Size"] = " one";
    dr2["Size"] = "two";
    table.Rows.Add(dr);
    table.Rows.Add(dr2);
    table.Rows.Add(dr3);
    return table;
 //and on my constructor I set gridview.DataSource=Datatable;
}