检查从datagridview复制并粘贴到第二个datagridview 。

另外，你可以这样做：

  //将datagridview绑定到linq 
 var gd1 = 
从datagridview.Rows.Cast< DataGridViewRow>（）
选择新的{Column1 = a.Cells [Column1]。Value.ToString（）}）。tolist（）; 

 //循环dg1并将其保存到datagridview2 
 foreach（dg1中的var b）
 {
 datagridview2.Rows.Add（b.Column1）; 
} 
 

关于

for (int i = 0; i < form2.dataGridView1.Rows.Count; i++)
{                  

    if ( form2.dataGridView2.Rows[i].Cells[0].Value != null && 
         (bool) form2.dataGridView2.Rows[i].Cells[0].Value == true )
    {
        form2.dataGridView2.Rows.Add();
        for (int j = 1; j < form2.dataGridView1.Columns.Count; j++)
            form2.dataGridView2.Rows[i].Cells[j].Value = 
                form2.dataGridView1.Rows[i].Cells[j].Value;

    }

}  

the above code is not giving any result. please tell me how to copy the data of one datagridview to another?

Check Copy from datagridview and paste to second datagridview.

Also, you can do as the following:

//Bind datagridview to linq 
var gd1 = 
    ( from a in datagridview.Rows.Cast<DataGridViewRow>()
      select new {Column1 = a.Cells["Column1"].Value.ToString() }).tolist();

//loop dg1 and save it to datagridview2
foreach(var b in dg1)
{
    datagridview2.Rows.Add(b.Column1);    
}

Regards