Try using SqlDataAdapter for this job.
Or you can even try using SqlComamndBuilder (of OleDb for Access database instead of Sql):
private void Form1_Load(object sender, EventArgs e)
SqlConnection conn = new SqlConnection(Properties.Settings.Default.Database1ConnectionString);//Set the connection to the SQL server
adapter = new SqlDataAdapter("select * from Table1", conn); //Create a DataAdapter instance
dataset = new DataSet();
SqlCommandBuilder builder = new SqlCommandBuilder();//User a CommandBuilder to build insert, update automatically.
builder.DataAdapter = adapter;
adapter.Fill(dataset); //Fill the DataSet
dataGridView1.DataSource = dataset.Tables; //Bind the DataSet to a DataGridView
//You can add/remove/modify the Data in the DataGridView
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
adapter.Update(dataset);//Update all the modification to the DataBase
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