I would like to create SaveFileDialog with default file name from value DataGridViewCells
So far I tried
priva
The SaveFileDialog has a property intended for this purpose: DefaultFileName using Silverlight or FileName using .NET
Your (uncompilable) code from the question would become:
private void buttonSave_Click(object sender, EventArgs e)
{
SaveFileDialog mySaveFileDialog = new SaveFileDialog();
//Silverlight
mySaveFileDialog.DefaultFileName = myDataGridView.SelectedCells[2].Value.ToString();
//.NET
mySaveFileDialog.FileName = myDataGridView.SelectedCells[2].Value.ToString();
}