How to Edit and Update in the DataGridview in winform app using c#

If You use dataSet then see whether it have query for update or not in table adapter.
Now take a button on which click the data will be saved in database.
on this button click event use

private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                yourTableAdapter.Update(yourDataSet.tablename);
                MessageBox.Show("Record Updated", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Some Error in Update", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
 
        }

Dataset is the main part in all your operations.

1. Fetch the values in dataset from database.
2. Bind it with gridview. Put gridview editable (so user edit values whatever
they want)
3. after editing put gridview table to dataaset.
4. finally update dataset to database.

Gridview changes to dataset.

DataTable dt = (DataTable)GridView1.DataSource; 
 Dataset ds = new dataSet;
 ds.tables[0] =  dt 

and then Save Dataset Changes to a Database[^]

See this http://www.codeproject.com/KB/grid/DataGridView_manipulation.aspx

Refer this

edit update delete datagridview[^]

Add, Edit, and Delete in DataGridView with Paging[^]

Refer this:
http://forums.devshed.com/net-development-87/c-winform-editing-datagridview-and-saving-changes-to-db-579949.html[^]