question

Why does the SQL Command not Delete the Data from the Database, in the properties i have already set the sql command text on the Delete Comand. Is the sql Command used rightly?

public Form1()
{
InitializeComponent();
sqlConnection1.Open();
}

     private void recreateXML_Click(object sender, EventArgs e)
     {

         dataSet11.Clear();
         sqlDataAdapter1.Update(dataSet11);

         String filePath = "";
         openFileDialog1.Filter = "XML files (*.xml)|*.xml|All files (*.*)|*.*";

         if (openFileDialog1.ShowDialog() == DialogResult.OK)
         {
             filePath = openFileDialog1.FileName;

             dataSet11.ReadXml(filePath);
             sqlCommand1.ExecuteNonQuery();
             sqlDataAdapter1.Update(dataSet11);
         }
     }

     private void updateButton_Click(object sender, EventArgs e)
     {
         sqlDataAdapter1.Update(dataSet11);
     }

     private void deleteButton_Click(object sender, EventArgs e)
     {
         foreach(DataGridViewRow row in dataGridView1.SelectedRows)
         {
             dataGridView1.Rows.Remove(row);
         }
         sqlDataAdapter1.Update(dataSet11);
     }
 }

}