fixes export being impossible

Form1.cs

@@ -30,7 +30,6 @@ namespace it_projekt
         private void loginBtn_Click(object sender, EventArgs e)
         {
             LoadUsersFromTable(this.userTxt.Text, this.passTxt.Text);
-
         }
 
 
@@ -47,6 +46,8 @@ namespace it_projekt
                 {
                     this.dataGrid.Rows.Add(person.Id, person.Firstname, person.Lastname, person.department_short, person.department_long, person.CreationDate, false);
                 }
+                this.loginBtn.Enabled = false;
+                this.exportBtn.Enabled = true;
             }
         }