C# for textbox to send data to arcgis back to griddataview

In c# windows forms app how do i make my text box send data to arcgis and back to datagridview to check the address of a location to make sure its there. this is the code i was thinking so far just to send data to datagridview

if (e.RowIndex >= 0) {

DataGridViewRow row = this.dataGridView1.Rows[e.RowIndex];
Txt_name.Text = row.Cells["Name"].Value.ToString();

probably got it backwards to. can anyone help me out? need help coding for arcgis to send data there and back.