using like operator in if operator in C# - c#-4.0

Question

I have a textbox for search (that is, textBox1)
A user, for example, enters "aba" in textBox1.
"abandon" puts in datagridiew1.
The user clicks on datagriview1:
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
richTextBox_MWE.Text = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
if ("richTextBox_MWE.Text like '%" + textBox1.Text + "%'")
{
label5.BackColor = Color.Green;
}
}
I want if "abandon" is such as "aba" in textBox1, label5.BackColor becomes Green.

Answer 1

Simple way is use the textBox1(where actually filter content going to change) change event
if(!String.IsNullOrEmpty(richTextBox_MWE.Text) && richTextBox_MWE.Text.Trim().Contains(textBox1.Text.Trim()))
{
label5.BackColor = Color.Green;
}

Answer 2

You want to use some kind of mix of C# and sql :) You can use the String.Contains method to achieve what you want.
if(richTextBox_MWE.Text != null
&& richTextBox_MWE.Text.Contains(textBox1.Text.Trim())
{
...
}

Answer 3

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
richTextBox_MWE.Text = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
if (!String.IsNullOrEmpty(richTextBox_MWE.Text) && !String.IsNullOrEmpty(textBox1.Text) && richTextBox_MWE.Text.Contains(textBox1.Text.Trim()))
{
label5.BackColor = Color.Green;
}
}
Here the contains will accept the value to be searched.

Answer 4

See snippet from my code. The txtProductCode is a text box that user is filling the product_code for searching in the list view.
string tmpProductCode = txtProductCode.Text.Trim();
string tmpProductCodePattern = "^" + Regex.Escape(tmpProductCode).Replace("%", ".*") + "$";
In my loop of product_code(s) the prodCode will contain the product_code value for each loop.
productCodeClause = false;
if (tmpProductCode.Equals(""))
{
productCodeClause = true;
}
else
{
if (Regex.IsMatch(prodCode, tmpProductCodePattern))
{
productCodeClause = true;
}
}
I hope this will be helpful.