System. NullReferenceException: "the object reference not set to an instance of an object," System. Windows. Forms. DataGridViewCell. Value. Get returns null,

Under the guidance of the great god, how to deal with:

String beizhu;
If (the Convert. ToString (dataGridView1. Rows [I] Cells [" bz] Value. The ToString ())!="")
{
Beizhu=dataGridView1. Rows [I] Cells [" bz] Value. The ToString ();
}
The else
{
Beizhu="NULL".
}

CodePudding user response:

 
String beizhu; 
If (dataGridView1. Rows [I] Cells [" bz] the Value!=null & amp; & DataGridView1. Rows [I] Cells [" bz] Value. The ToString ()!="") 
{
Beizhu=dataGridView1. Rows [I] Cells [" bz] Value. The ToString (); 
} 
The else 
{
Beizhu="NULL". 
}