private void 删除字段ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FrmDeleteFieldFromLayer deleteField = new FrmDeleteFieldFromLayer(geoLayer, dataGridView1);
     deleteField.Show(this);
 }
        private void  除字段ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FrmDeleteFieldFromLayer deleteField = new FrmDeleteFieldFromLayer(geoLayer, dataGridView1);

            deleteField.Show(this);
        }