How do I use information in textbox to show information datagridviewrow

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I have to tabs, I'm trying to write a code so that if the text in the textbox in tab 1 matches a word in the datagridview in tab 2, only show those rows, is it possible?

Here's the code I've written ...

C#

private void textBox2_Leave(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox2.Text))
            {
                (dataGridView1.DataSource as DataTable).DefaultView.RowFilter = string.Empty;
            }
            else
            {
                (dataGridView1.DataSource as DataTable).DefaultView.RowFilter = string.Format("Name='{0}'", textBox2.Text);
            }

But nothing appears in the datagridview box when I run the program and I get the error message off...

An unhandled exception of type 'System.NullReferenceException' occurred in Monitoring and management system.exe

What I have tried:

C#

private void textBox2_Leave(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox2.Text))
            {
                (dataGridView1.DataSource as DataTable).DefaultView.RowFilter = string.Empty;
            }
            else
            {
                (dataGridView1.DataSource as DataTable).DefaultView.RowFilter = string.Format("Name='{0}'", textBox2.Text);
            }

Posted 11-Feb-18 9:28am

Member 13512434

Updated 11-Feb-18 21:02pm

v3

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Hermann Jung · Answer 1 · 2018-02-11T21:02:00

It looks like dataGridView1.DataSource is not of type DataTable.
If dataGridView1 is bound to a DataSet, DataTable or DataView the following code should work

var cm = (CurrencyManager)dataGridView1.BindingContext[dataGridView1.DataSource, dataGridView1.DataMember];
var dataView = (DataView)cm.List;
dataView.RowFilter = string.Format("Name='{0}'", textBox2.Text);