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Hello Geeks,

I have one combo box in my form with database value integrate. It's work perfectly for single selection. Now I want to make it multiple selection. How I do this. Please guide me.

What I have tried:

I have tried so many ways but can't find solution.
Updated 12-Apr-22 8:46am

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CodeProject is your friend: "CheckBox ComboBox Extending the ComboBox Class and Its Items" [^], and read the comments here: [^]
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SqlCommand cmd = new SqlCommand("Select * from Add_Stock", con);
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
comboBox1.Items.Add(ds.Tables[0].Rows[i]["pdetails"] + " " + ds.Tables[0].Rows[i]["batchno"] + " " + Convert.ToDateTime(ds.Tables[0].Rows[i]["expdate"]).ToShortDateString() + " " + ds.Tables[0].Rows[i]["sttokk"]);

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