How to populate a combobox of C# winform with database tables.

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Hello Everyone!,

In C# winform application I want to display all the names of the tables which exists in my StoreDatabase. into a combobox (Dropdown).

In my Store database there are some tables which I want to show inside the dropdown. As the end-user clicks the dropdown, It will show all the lists of tables.

Here is the code Which I m trying

What I have tried:

// C# Source Code :

DataTable dt = new DataTable();
MySqlConnection conn = new MySqlConnection(@"Server=localhost;Database=Generalstore;Username=my********;Password:********;");
conn.Open();
MySqlDataAdapter da = new MySqlDataAdapter(@"show tables", conn);

da.Fill(dt);

            if (dt.Rows.Count > 0)
{
comboBox1.DisplayMember = "alloyName";
comboBox1.ValueMember = "alloyName";
comboBox1.DataSource = dt;
}
conn.Close();
}

Posted 13-Nov-22 8:37am

Nikhil Yogi

Updated 13-Nov-22 16:05pm

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[no name] 13-Nov-22 16:06pm

https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.combobox.objectcollection.add?view=windowsdesktop-6.0

M Imran Ansari 13-Nov-22 16:15pm

Your code is looking good. What error you are getting?

adriancs 13-Nov-22 22:03pm

@M Imran Ansari, he is typing the wrong column name. "alloyName" is not existed in "show tables"

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adriancs · Answer 1 · 2022-11-13T16:05:00

Solution 1

You are doing this:

C#

comboBox1.DisplayMember = "alloyName";
comboBox1.ValueMember = "alloyName";
comboBox1.DataSource = dt;

which "alloyName" is not existed.

You can type this in stead:

C#

comboBox1.Items.Clear();
foreach (DataRow dr in dt.Rows)
{
    comboBox1.Items.Add(dr[0] + "");
}

Posted 13-Nov-22 16:05pm

adriancs

Updated 13-Nov-22 16:06pm

v2