How do you pick particular value from the Datatable

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Hi All,

I have a DataTable m_dtDelayedDeliveryDays in my.vb application.With this Data table i loaded my combo box .

The Data table has values like this:
ID DelayDays
6 0
8 3
9 7
10 15
11 20
12 30

Now my combo box contains DelayDays. Based on the user selection say 3 i need ID as 8.
How do i do this in vb.net..Please help.

I tried this but it didnt work:

Dim selectedDataRow As Integer = DirectCast(cmbDelayedDeliveryDays.SelectedItem, DataRowView).Row
Dim delayId As Integer = Convert.ToInt32(selectedDataRow(DeliveryDelayDaysID"))

This is throwing an error"Unable to cast object of type 'System.Int32' to type 'System.Data.DataRowView'."

Please help.

Thanks.

Posted 18-Feb-13 8:16am

vidkaat

Updated 19-Feb-13 3:49am

v3

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Jibesh · Answer 1 · 2013-02-18T08:44:00

Solution 2

You can use the DataSource binding method to easily access this.

C#

comboBox.DisplayMember  ="DelayDays";//where DelayDays is the column name
comboBox.ValueMember = "ID"; //where ID is the column name
comboBox.DataSource = m_dtDelayedDeliveryDays ;

Now to get the selected value.

C#

string id = comboBox.SelectedValue.ToString();//this will give you the id 8 for the display text 3

Posted 18-Feb-13 8:44am

Jibesh

Updated 18-Feb-13 8:49am

v2

Comments

vidkaat 18-Feb-13 15:02pm

Thank u will try.

vidkaat 19-Feb-13 9:28am

This didnt work.

Jibesh 19-Feb-13 12:27pm

what you have tried. It works fine for me. may I see your code, your table column Names and how you are trying to get the values.

here is what I tried.

private void Form_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("Id", typeof(Int32)));
dt.Columns.Add(new DataColumn("DelayDays", typeof(Int32)));

dt.Rows.Add(6, 0);
dt.Rows.Add(8, 3);
dt.Rows.Add(9, 7);
dt.Rows.Add(10, 15);

this.comboBox1.ValueMember = "Id";
this.comboBox1.DisplayMember = "DelayDays";
this.comboBox1.DataSource = dt;
}

private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(this.comboBox1.SelectedValue.ToString());
}

You should note that column name of the table and the Value/Display member must match. check that too.

Hasham Ahmad · Answer 2 · 2013-02-18T08:25:00

Solution 1

use the following line of code

C#

int cboIndex = cboCountry.SelectedIndex;
string strId = this.cboCountry.Items[cboIndex].ToString();

for further reference click here[^]

Posted 18-Feb-13 8:25am

Hasham Ahmad

Comments

vidkaat 18-Feb-13 15:02pm

Thank u will try

vidkaat 19-Feb-13 9:43am

This case it takes the index as 0 ..It is not returning the ID from my datatable based on the selection made in the combo box

Hasham Ahmad 19-Feb-13 9:57am

can you share the code which is not returning your desired value?

vidkaat 19-Feb-13 10:01am

row = DirectCast(cmbDelayedDeliveryDays.SelectedItem, DataRowView).Row
Dim delayId As Integer = Convert.ToInt32(row("DeliveryDelayDaysID"))