no overload for method takes '1' arguments

Question

Hi all! 

I have a problem, I am using this code in a software and I am getting a error in GetData(cmd).

I have done it another way but I want to know what's really problem, can anybody help me?

string dbconnection = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;

    

    private void BindData()

    {

        SqlConnection con = new SqlConnection(dbconnection);

        string strQuery = "select CustomerID,ContactName,CompanyName " + " from customers";

        SqlCommand cmd = new SqlCommand(strQuery);

        GridView1.DataSource = GetData(cmd);

// => getting eror (no overload for method 'GetData' takes '1' arguments)

        GridView1.DataBind();

    }

    private void GetData()

    {

        GridView1.DataBind();

    }

Thanks