Remove the item from ComboBox once it's been selected in the previous

I'm lost here, I wanna remove the item from ComboBox once it's been selected in the previous ComboBox. I have tried many approaches but didn't resolve this problem. Please help me in solving this problem and below I've included all of the code. Any tips would be greatly appreciated!

ComboBox[] combo_for_constraint = new ComboBox[count];
int combo_for_constraint_x = 250, combo_for_constraint_y = 50;
for (int i = 1; i < count; i++)
{
combo_for_constraint[i] = new ComboBox();
combo_for_constraint[i].Location = new System.Drawing.Point(combo_for_constraint_x,
combo_for_constraint_y + (i * 10));
combo_for_constraint[i].Size = new Size(100, 50);
combo_for_constraint[i].Name = "combo_for_constraintbx" + i.ToString();
combo_for_constraint[i].DropDownStyle = ComboBoxStyle.DropDownList;
tabPage2.Controls.Add(combo_for_constraint[i]);
tabPage2.ResumeLayout(false);
combo_for_constraint_y += 40;
tabPage2.Refresh();
if (i >= 2 && combo_for_constraint[i - 1].Text == "PRIMARY KEY")
{
combo_for_constraint[i + 1].Items.RemoveAt(1);
}
else
{
combo_for_constraint[i].Items.Add("UNIQUE");
combo_for_constraint[i].Items.Add("PRIMARY KEY");
combo_for_constraint[i].Items.Add("FOREIGN KEY");
}
}

void ComboBuild()
{
combo_for_constraint = new ComboBox[count];
int combo_for_constraint_x = 250, combo_for_constraint_y = 50;
for (int i = 0; i < count; i++)
{
combo_for_constraint[i] = new ComboBox();
combo_for_constraint[i].Location = new System.Drawing.Point(combo_for_constraint_x,
combo_for_constraint_y + (i * 10));
combo_for_constraint[i].Size = new Size(100, 50);
combo_for_constraint[i].Name = "combo_for_constraintbx" + i.ToString();
combo_for_constraint[i].DropDownStyle = ComboBoxStyle.DropDownList;
tabPage2.Controls.Add(combo_for_constraint[i]);
tabPage2.ResumeLayout(false);
combo_for_constraint_y += 40;
tabPage2.Refresh();
combo_for_constraint[i].Items.Add("UNIQUE");
combo_for_constraint[i].Items.Add("PRIMARY KEY");
combo_for_constraint[i].Items.Add("FOREIGN KEY");
//combo_for_constraint[i].SelectedIndex = 0;
combo_for_constraint[i].SelectedIndexChanged += new System.EventHandler(Combo1_SelectedIndexChanged);
}
}
private void Combo1_SelectedIndexChanged(object sender, EventArgs e)
{
ComboBox comboBox = (ComboBox)sender;
for (int i = 0; i < int.Parse(textBox3.Text); i++)
{
if (comboBox == combo_for_constraint[i] && combo_for_constraint[i].Text == "PRIMARY KEY")
{
for (int j = 0; j < int.Parse(textBox3.Text); j++)
{
if (combo_for_constraint[j].Text == "PRIMARY KEY")
{
continue;
}
else
combo_for_constraint[j].Items.Remove("PRIMARY KEY");
}
}
}
}

Hello Muhammad Ahsan,

Try the below code. If the below code does not solve your problem, please explain what is the exact requirement.

I have corrected based on shared your code knowledge. let me know if you need any help with this requirement.

ComboBox[] combo_for_constraint = new ComboBox[10];
int combo_for_constraint_x = 250, combo_for_constraint_y = 50;
for (int i = 1; i < 10; i++)
{
combo_for_constraint[i] = new ComboBox();
combo_for_constraint[i].Location = new System.Drawing.Point(combo_for_constraint_x,
combo_for_constraint_y + (i * 10));
combo_for_constraint[i].Size = new Size(100, 50);
combo_for_constraint[i].Name = "combo_for_constraintbx" + i.ToString();
combo_for_constraint[i].DropDownStyle = ComboBoxStyle.DropDownList;
panel1.Controls.Add(combo_for_constraint[i]);
panel1.ResumeLayout(false);
combo_for_constraint_y += 40;
panel1.Refresh();
combo_for_constraint[i].Items.Add("UNIQUE");
combo_for_constraint[i].Items.Add("PRIMARY KEY");
combo_for_constraint[i].Items.Add("FOREIGN KEY");
if (i >= 2)
{
combo_for_constraint[i].Items.Remove(combo_for_constraint[i - 1].Text);
}
combo_for_constraint[i].SelectedIndex = 0;
}

Good Luck.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Muhammad Ahsan5y ago
1. void ComboBuild()
2. {
3. combo_for_constraint = new ComboBox[count];
4. int combo_for_constraint_x = 250, combo_for_constraint_y = 50;
5. for (int i = 0; i < count; i++)
6. {
7. combo_for_constraint[i] = new ComboBox();
8. combo_for_constraint[i].Location = new System.Drawing.Point(combo_for_constraint_x,
9. combo_for_constraint_y + (i * 10));
10. combo_for_constraint[i].Size = new Size(100, 50);
11. combo_for_constraint[i].Name = "combo_for_constraintbx" + i.ToString();
12. combo_for_constraint[i].DropDownStyle = ComboBoxStyle.DropDownList;
13. tabPage2.Controls.Add(combo_for_constraint[i]);
14. tabPage2.ResumeLayout(false);
15. combo_for_constraint_y += 40;
16. tabPage2.Refresh();
17. combo_for_constraint[i].Items.Add("UNIQUE");
18. combo_for_constraint[i].Items.Add("PRIMARY KEY");
19. combo_for_constraint[i].Items.Add("FOREIGN KEY");
20. //combo_for_constraint[i].SelectedIndex = 0;
21. combo_for_constraint[i].SelectedIndexChanged += new System.EventHandler(Combo1_SelectedIndexChanged);
22. }
23. }
26. private void Combo1_SelectedIndexChanged(object sender, EventArgs e)
27. {
28. ComboBox comboBox = (ComboBox)sender;
29. for (int i = 0; i < int.Parse(textBox3.Text); i++)
30. {
31. if (comboBox == combo_for_constraint[i] && combo_for_constraint[i].Text == "PRIMARY KEY")
32. {
33. for (int j = 0; j < int.Parse(textBox3.Text); j++)
34. {
35. if (combo_for_constraint[j].Text == "PRIMARY KEY")
36. {
37. continue;
38. }
39. else
40. combo_for_constraint[j].Items.Remove("PRIMARY KEY");
41. }
42. }
43. }
44. }
Finally solved