How to save combobox content into mysql table?

Problem :

I have an issue here .. i cant save combobox content into my table ... all other data are successfully saved but the combo box is saved either 1 or zero .. what seems to be wrong?

My tables are designed through navicat .. does this have anything to do with my choice of data type? knowing that I chose the data type to be Text

This is my code and it shows no run errors

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim conStr As String = ("Data Source=localhost;user id=root;password=123456;database=sam;")
            Dim con As New MySqlConnection(conStr)
            Dim cmd As MySqlCommand

            For i = 0 To ComboBox4.Items.Count

                Dim sqls As String = "INSERT INTO initial_nom(f_name,s_name,th_name,fo_name,app_no,adm_type) VALUES('" & TextBox1.Text & "', '" & TextBox2.Text & "', '" & TextBox3.Text & "', '" & TextBox4.Text & "'," & TextBox5.Text & ",'" & ComboBox4.SelectedIndex.ToString & "')"
                cmd = New MySqlCommand(sqls, con)
        Catch ex As Exception
            MsgBox("Error in saving to Database. Error is :" & ex.Message)
        End Try
    End Sub

Solution :

SelectedIndex is integer which point to index of the selected item. Assuming that combobox's data source contains collection of string, try to use SelectedItem instead, type-cast it to string :

DirectCast(ComboBox4.SelectedItem, String)

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