How do I set the selected item in a comboBox to match my string using C#?

This should do the trick:

Combox1.SelectedIndex = Combox1.FindStringExact("test1")

Have you tried the Text property? It works for me.

ComboBox1.Text = "test1";

The SelectedText property is for the selected portion of the editable text in the textbox part of the combo box.

Assuming that your combobox isn't databound you would need to find the object's index in the "items" collection on your form and then set the "selectedindex" property to the appropriate index.

comboBox1.SelectedIndex = comboBox1.Items.IndexOf("test1");

Keep in mind that the IndexOf function may throw an argumentexception if the item isn't found.

If the items in your ComboBox are strings, you can try:

comboBox1.SelectedItem = "test1";

ComboBox1.SelectedIndex= ComboBox1.FindString("Matching String");

Try this in windows Form.

SelectedText is to get or set the actual text in the string editor for the selected item in the combobox as documented here . This goes uneditable if you set:

comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;

Use:

comboBox1.SelectedItem = "test1";

or:

comboBox1.SelectedIndex = comboBox1.Items.IndexOf("test1");

Supposing test1, test2, test3 belong to comboBox1 collection following statement will work.

comboBox1.SelectedIndex = 0; 

• Enumerate ListItems in combobox
• Get equal ones listindex set combobox
• Set listindex to the found one.

But if I see such a code as a code reviewer, I would recommend to reconsider all the method algorithm.

You don't have that property in the ComboBox. You have SelectedItem or SelectedIndex. If you have the objects you used to fill the combo box then you can use SelectedItem.

If not you can get the collection of items (property Items) and iterate that until you get the value you want and use that with the other properties.

hope it helps.

_cmbTemplates.SelectedText = "test1"

or maybe

_cmbTemplates.SelectedItem= _cmbTemplates.Items.Equals("test1");

Find mySecondObject (of type MyObject) in combobox (containing a list of MyObjects) and select the item:

foreach (MyObject item in comboBox.Items)
{
   if (item.NameOrID == mySecondObject.NameOrID)
    {
        comboBox.SelectedItem = item;
        break;
    }
}

this works for me.....

comboBox.DataSource.To<DataTable>().Select(" valueMember = '" + valueToBeSelected + "'")[0]["DislplayMember"];

I know this isn't what the OP asked but could it be that they don't know? There are already several answers here so even though this is lengthy I thought it could be useful to the community.

Using an enum to fill a combo box allows for easy use of the SelectedItem method to programmatically select items in the combobox as well as loading and reading from the combobox.

public enum Tests
    {
        Test1,
        Test2,
        Test3,
        None
    }

// Fill up combobox with all the items in the Tests enum
    foreach (var test in Enum.GetNames(typeof(Tests)))
    {
        cmbTests.Items.Add(test);
    }

    // Select combobox item programmatically
    cmbTests.SelectedItem = Tests.None.ToString();

If you double click the combo box you can handle the selected index changed event:

private void cmbTests_SelectedIndexChanged(object sender, EventArgs e)
{
    if (!Enum.TryParse(cmbTests.Text, out Tests theTest))
    {
        MessageBox.Show($"Unable to convert {cmbTests.Text} to a valid member of the Tests enum");
        return;
    }

    switch (theTest)
    {
        case Tests.Test1:
            MessageBox.Show("Running Test 1");
            break;

        case Tests.Test2:
            MessageBox.Show("Running Test 2");
            break;

        case Tests.Test3:
            MessageBox.Show("Running Test 3");
            break;

        case Tests.None:

            // Do nothing

            break;

        default:
            MessageBox.Show($"No support for test {theTest}.  Please add");
            return;
    }
}

You can then run tests from a button click handler event:

 private void btnRunTest1_Click(object sender, EventArgs e)
    {
        cmbTests.SelectedItem = Tests.Test1.ToString();
    }

if you are binding Datasource via Dataset, then you should use "SelectedValue"

cmbCategoryList.SelectedValue = (int)dsLookUp.Tables[0].Select("WHERE PRODUCTCATEGORYID = 1")[0]["ID"];

Please try this way, it works for me:

Combobox1.items[Combobox1.selectedIndex] = "replaced text";