i get data from database

Question

try

{

if (comboBox1.SelectedIndex >= 0)

{

if (con.State == ConnectionState.Closed)

con.Open();

da = new SqlDataAdapter("select Student_Name, Father_Name from Admission where Admission_ID '" + comboBox1.SelectedValue + " '", con);

dt = new DataTable();

DataTable studentdatabase = new DataTable();

da.Fill(studentdatabase);

dataGridView1.DataSource = new BindingSource(studentdatabase, null);

con.Close();

}

else

{

MessageBox.Show("Select an Batch No");

}

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

    

 

 but following error

 

Incorrect syntax near 'hghgh '.

hghgh is my Admission_ID.